refactor(web): common template for index pages of tvl and atward r/2585

Use simple string interpolation based approach to templating and allow
changing the main body, the title and to inject extra HTML into the head
element. Additionally we can use `https://tvl.fyi/` instead of `/` when
referring to assets.

One limitation currently is that the template only works for index pages
(it link to self using `href="/"`), but this should be easy to fix.

For atward, instead of using the `onload` attribute of `body`, we now
register an event listener in JavaScript which makes the template code
less complicated. When building the derivation the template is rendered
to HTML and injected into the source.

Change-Id: I2ea0c5bf5f6286e781285ade7751a348bab3bdc8
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3112
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>

1 files changed, 3 insertions, 0 deletions

diff --git a/web/atward/default.nix b/web/atward/default.nix
index e50ac32be4..f3ed04345c 100644
--- a/web/atward/default.nix
+++ b/web/atward/default.nix
@@ -2,4 +2,7 @@
 
 depot.third_party.naersk.buildPackage {
   src = ./.;
+  override = x: {
+    ATWARD_INDEX_HTML = depot.web.atward.indexHtml;
+  };
 }