chore: Remove remaining Bazel-related files r/31

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diff --git a/third_party/bazel/rules_nixpkgs/README.md b/third_party/bazel/rules_nixpkgs/README.md
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-# rules_nixpkgs
-
-[![CircleCI](https://circleci.com/gh/tweag/rules_nixpkgs.svg?style=svg)](https://circleci.com/gh/tweag/rules_nixpkgs)
-
-Rules for importing Nixpkgs packages into Bazel.
-
-## Rules
-
-* [nixpkgs_git_repository](#nixpkgs_git_repository)
-* [nixpkgs_package](#nixpkgs_package)
-
-## Setup
-
-Add the following to your `WORKSPACE` file, and select a `$COMMIT` accordingly.
-
-```bzl
-http_archive(
-    name = "io_tweag_rules_nixpkgs",
-    strip_prefix = "rules_nixpkgs-$COMMIT",
-    urls = ["https://github.com/tweag/rules_nixpkgs/archive/$COMMIT.tar.gz"],
-)
-
-load("@io_tweag_rules_nixpkgs//nixpkgs:nixpkgs.bzl", "nixpkgs_git_repository", "nixpkgs_package")
-```
-
-## Example
-
-```bzl
-nixpkgs_git_repository(
-    name = "nixpkgs",
-    revision = "17.09", # Any tag or commit hash
-    sha256 = "" # optional sha to verify package integrity!
-)
-
-nixpkgs_package(
-    name = "hello",
-    repositories = { "nixpkgs": "@nixpkgs//:default.nix" }
-)
-```
-
-## Rules
-
-### nixpkgs_git_repository
-
-Name a specific revision of Nixpkgs on GitHub or a local checkout.
-
-```bzl
-nixpkgs_git_repository(name, revision, sha256)
-```
-
-<table class="table table-condensed table-bordered table-params">
-  <colgroup>
-    <col class="col-param" />
-    <col class="param-description" />
-  </colgroup>
-  <thead>
-    <tr>
-      <th colspan="2">Attributes</th>
-    </tr>
-  </thead>
-  <tbody>
-    <tr>
-      <td><code>name</code></td>
-      <td>
-        <p><code>Name; required</code></p>
-        <p>A unique name for this repository.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>revision</code></td>
-      <td>
-        <p><code>String; required</code></p>
-        <p>Git commit hash or tag identifying the version of Nixpkgs
-           to use.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>remote</code></td>
-      <td>
-        <p><code>String; optional</code></p>
-        <p>The URI of the remote Git repository. This must be a HTTP
-           URL. There is currently no support for authentication.
-           Defaults to <a href="https://github.com/NixOS/nixpkgs">
-           upstream nixpkgs.</a></p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>sha256</code></td>
-      <td>
-        <p><code>String; optional</code></p>
-        <p>The SHA256 used to verify the integrity of the repository.</p>
-      </td>
-    </tr>
-  </tbody>
-</table>
-
-### nixpkgs_local_repository
-
-Create an external repository representing the content of Nixpkgs,
-based on a Nix expression stored locally or provided inline. One of
-`nix_file` or `nix_file_content` must be provided.
-
-```bzl
-nixpkgs_local_repository(name, nix_file, nix_file_deps, nix_file_content)
-```
-
-<table class="table table-condensed table-bordered table-params">
-  <colgroup>
-    <col class="col-param" />
-    <col class="param-description" />
-  </colgroup>
-  <thead>
-    <tr>
-      <th colspan="2">Attributes</th>
-    </tr>
-  </thead>
-  <tbody>
-    <tr>
-      <td><code>name</code></td>
-      <td>
-        <p><code>Name; required</code></p>
-        <p>A unique name for this repository.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>nix_file</code></td>
-      <td>
-        <p><code>String; optional</code></p>
-        <p>A file containing an expression for a Nix derivation.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>nix_file_deps</code></td>
-      <td>
-        <p><code>List of labels; optional</code></p>
-        <p>Dependencies of `nix_file` if any.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>nix_file_content</code></td>
-      <td>
-        <p><code>String; optional</code></p>
-        <p>An expression for a Nix derivation.</p>
-      </td>
-    </tr>
-  </tbody>
-</table>
-
-### nixpkgs_package
-
-Make the content of a Nixpkgs package available in the Bazel workspace.
-
-```bzl
-nixpkgs_package(
-    name, attribute_path, nix_file, nix_file_deps, nix_file_content,
-    repository, repositories, build_file, build_file_content, nixopts,
-    fail_not_supported,
-)
-```
-
-If `repositories` is not specified, you must provide a
-nixpkgs clone in `nix_file` or `nix_file_content`.
-
-<table class="table table-condensed table-bordered table-params">
-  <colgroup>
-    <col class="col-param" />
-    <col class="param-description" />
-  </colgroup>
-  <thead>
-    <tr>
-      <th colspan="2">Attributes</th>
-    </tr>
-  </thead>
-  <tbody>
-    <tr>
-      <td><code>name</code></td>
-      <td>
-        <p><code>Name; required</code></p>
-        <p>A unique name for this target</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>attribute_path</code></td>
-      <td>
-        <p><code>String; optional</code></p>
-        <p>Select an attribute from the top-level Nix expression being
-           evaluated. The attribute path is a sequence of attribute
-           names separated by dots.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>nix_file</code></td>
-      <td>
-        <p><code>String; optional</code></p>
-        <p>A file containing an expression for a Nix derivation.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>nix_file_deps</code></td>
-      <td>
-        <p><code>List of labels; optional</code></p>
-        <p>Dependencies of `nix_file` if any.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>nix_file_content</code></td>
-      <td>
-        <p><code>String; optional</code></p>
-        <p>An expression for a Nix derivation.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>repository</code></td>
-      <td>
-        <p><code>Label; optional</code></p>
-        <p>A repository label identifying which Nixpkgs to use.
-           Equivalent to `repositories = { "nixpkgs": ...}`</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>repositories</code></td>
-      <td>
-        <p><code>String-keyed label dict; optional</code></p>
-        <p>A dictionary mapping `NIX_PATH` entries to repository labels.</p>
-        <p>Setting it to
-           <pre><code>repositories = { "myrepo" : "//:myrepo" }</code></pre>
-           for example would replace all instances
-           of <code>&lt;myrepo&gt;</code> in the called nix code by the
-           path to the target <code>"//:myrepo"</code>. See the
-           <a href="https://nixos.org/nix/manual/#env-NIX_PATH">relevant
-           section in the nix manual</a> for more information.</p>
-        <p>Specify one of `path` or `repositories`.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>build_file</code></td>
-      <td>
-        <p><code>Label; optional</code></p>
-        <p>The file to use as the BUILD file for this repository.
-           Its contents are copied copied into the file
-           <code>BUILD</code> in root of the nix output folder.
-           The Label does not need to be named BUILD, but can be.
-        </p>
-        <p>For common use cases we provide filegroups that expose
-           certain files as targets:
-          <dl>
-            <dt><code>:bin</code></dt>
-            <dd>Everything in the <code>bin/</code> directory.</dd>
-            <dt><code>:lib</code></dt>
-            <dd>All <code>.so</code> and <code>.a</code> files
-              that can be found in subdirectories of
-              <code>lib/</code>.</dd>
-            <dt><code>:include</code></dt>
-            <dd>All <code>.h</code> files
-              that can be found in subdirectories of
-              <code>bin/</code>.</dd>
-          </dl>
-        </p>
-        <p>If you need different files from the nix package,
-          you can reference them like this: <pre><code>package(default_visibility = [ "//visibility:public" ])
-filegroup(
-  name = "our-docs",
-  srcs = glob(["share/doc/ourpackage/**/*"]),
-)</code></pre>
-          See the bazel documentation of
-          <a href="https://docs.bazel.build/versions/master/be/general.html#filegroup">filegroup</a>
-          and
-          <a href="https://docs.bazel.build/versions/master/be/functions.html#glob">glob</a>.
-        </p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>build_file_content</code></td>
-      <td>
-        <p><code>String; optional</code></p>
-        <p>Like <code>build_file</code>, but a string of the contents
-          instead of a file name.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>nixopts</code></td>
-      <td>
-        <p><code>String list; optional</code></p>
-        <p>Extra flags to pass when calling Nix.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>fail_not_supported</code></td>
-      <td>
-        <p><code>Boolean; optional; default = True</code></p>
-        <p>
-            If set to <code>True</code> (default) this rule will fail on
-            platforms which do not support Nix (e.g. Windows). If set to
-            <code>False</code> calling this rule will succeed but no output
-            will be generated.
-        </p>
-      </td>
-    </tr>
-  </tbody>
-</table>
-
-### nixpkgs_cc_configure
-
-Tells Bazel to use compilers and linkers from Nixpkgs for the CC
-toolchain. By default, Bazel autodetects a toolchain on the current
-`PATH`. Overriding this autodetection makes builds more hermetic and
-is considered a best practice.
-
-Example:
-
-```bzl
-nixpkgs_cc_configure(repository = "@nixpkgs//:default.nix")
-```
-
-<table class="table table-condensed table-bordered table-params">
-  <colgroup>
-    <col class="col-param" />
-    <col class="param-description" />
-  </colgroup>
-  <thead>
-    <tr>
-      <th colspan="2">Attributes</th>
-    </tr>
-  </thead>
-  <tbody>
-    <tr>
-      <td><code>nix_file</code></td>
-      <td>
-        <p><code>String; optional</code></p>
-        <p>An expression for a Nix environment derivation. The
-           environment should expose all the commands that make up
-           a CC toolchain (`cc`, `ld` etc). Exposes all commands in
-           `stdenv.cc` and `binutils` by default.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>nix_file_deps</code></td>
-      <td>
-        <p><code>List of labels; optional</code></p>
-        <p>Dependencies of `nix_file` if any.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>nix_file_content</code></td>
-      <td>
-        <p><code>String; optional</code></p>
-        <p>An expression for a Nix environment derivation.</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>repository</code></td>
-      <td>
-        <p><code>Label; optional</code></p>
-        <p>A repository label identifying which Nixpkgs to use.
-           Equivalent to `repositories = { "nixpkgs": ...}`</p>
-      </td>
-    </tr>
-    <tr>
-      <td><code>repositories</code></td>
-      <td>
-        <p><code>String-keyed label dict; optional</code></p>
-        <p>A dictionary mapping `NIX_PATH` entries to repository labels.</p>
-        <p>Setting it to
-           <pre><code>repositories = { "myrepo" : "//:myrepo" }</code></pre>
-           for example would replace all instances
-           of <code>&lt;myrepo&gt;</code> in the called nix code by the
-           path to the target <code>"//:myrepo"</code>. See the
-           <a href="https://nixos.org/nix/manual/#env-NIX_PATH">relevant
-           section in the nix manual</a> for more information.</p>
-        <p>Specify one of `path` or `repositories`.</p>
-      </td>
-    </tr>
-  </tbody>
-</table>
-
-## Migration
-
-### `path` Attribute
-
-`path` was an attribute from the early days of `rules_nixpkgs`, and
-its ability to reference arbitrary paths a danger to build hermeticity.
-
-Replace it with either `nixpkgs_git_repository` if you need
-a specific version of `nixpkgs`. If you absolutely *must* depend on a
-local folder, use bazel’s
-[`local_repository` workspace rule](https://docs.bazel.build/versions/master/be/workspace.html#local_repository).
-Both approaches work well with the `repositories` attribute of `nixpkgs_package`.
-
-```bzl
-local_repository(
-  name = "local-nixpkgs",
-  path = "/path/to/nixpkgs",
-)
-
-nixpkgs_package(
-  name = "somepackage",
-  repositories = {
-    "nixpkgs": "@local-nixpkgs//:default.nix",
-  },
-  …
-)
-```