feat(tools/nixery): Absorb Nixery into depot r/3978

This absorbs a josh-filtered Nix subtree into depot, at
//tools/nixery.

This subtree was created through `josh-filter ':prefix=tools/nixery'`,
which allows a filter on tools/nixery to yield the same commit hashes
as the original Nixery repository (allowing for history continuity).

Change-Id: Icc1a99bf1248226b91f437b0a90361d36fb0d327

1 files changed, 3 insertions, 0 deletions

diff --git a/tools/nixery/docs/theme/nixery.css b/tools/nixery/docs/theme/nixery.css
new file mode 100644
index 000000000000..c240e693d550
--- /dev/null
+++ b/tools/nixery/docs/theme/nixery.css
@@ -0,0 +1,3 @@
+h2, h3 {
+  margin-top: 1em;
+}