rename to 'rethink development', brighten lib table, drop stale note

- Rename site 'a rethink development' -> 'rethink development' (site_name,
  landing H1); copyright -> 'rethink development (handbook)'.
- libraries.md: remove the 'if the live list is empty' admonition now that
  Gitea CORS is fixed.
- extra.css: improve Library-column readability — brighter #cfe6ff code
  chips on a cyan-tinted bg, more weight, roomier cell padding (0.7/1em),
  nowrap lib names, accent-colored links.

Signed-off-by: disqualifier <dev@disqualifier.me>

docs/libraries.md

@@ -123,11 +123,3 @@ Pin a tag in your dependencies — never an unpinned branch:
   }
 })();
 </script>
-
-!!! info "If the live list is empty or stale"
-    The fetch runs in your browser against the Gitea API and needs the org repos
-    to be readable unauthenticated (they are — it's a public org) and CORS to
-    allow the docs domain. If the list won't load, browse the org directly at
-    [git.rethinkstudios.io/rethink-public](https://git.rethinkstudios.io/rethink-public).
-    The fallback for a disabled live fetch is a webhook rebuild — a push to any
-    `rethink-public` repo triggers a site rebuild.