feat(camden): Move cgit to code.tvl.fyi

Moves the host at which cgit is served to 'code.tvl.fyi'.

Also updates related projects that link to this, most importantly:

* Hound's & Gerrit's cgit link bases have been updated
* besadii is updated to request CI builds for the new location

Change-Id: I44e3e584010ac29cc913ebb1a197c996eb024d80
Reviewed-on: https://cl.tvl.fyi/c/depot/+/71
Reviewed-by: lukegb <lukegb@tvl.fyi>

web/cgit-taz/default.nix

@@ -28,7 +28,7 @@ let
     repo.path=/var/lib/gerrit/git/depot.git/
     repo.desc=monorepo for tazjin's virus lounge
     repo.owner=tazjin <mail@tazj.in>
-    repo.clone-url=https://git.tazj.in
+    repo.clone-url=https://code.tvl.fyi
   '';
 
   thttpdConfig = writeText "thttpd.conf" ''