Merge branch 'main' into glitch-soc/merge-upstream

Conflicts:
- `.prettierignore`:
  Upstream added a line at the end of the file, while glitch-soc had its own
  extra lines.
  Took upstream's change.
- `CONTRIBUTING.md`:
  We have our custom CONTRIBUTING.md quoting upstream. Upstream made changes.
  Ported upstream changes.
- `app/controllers/application_controller.rb`:
  Upstream made code style changes in a method that is entirely replaced
  in glitch-soc.
  Ignored the change.
- `app/models/account.rb`:
  Code style changes textually close to glitch-soc-specific changes.
  Ported upstream changes.
- `lib/sanitize_ext/sanitize_config.rb`:
  Upstream code style changes.
  Ignored them.

app/javascript/styles/mastodon/admin.scss

@@ -384,7 +384,7 @@ $content-width: 840px;
           position: fixed;
           z-index: 10;
           width: 100%;
-          height: calc(100vh - 56px);
+          height: calc(100% - 56px);
           left: 0;
           bottom: 0;
           overflow-y: auto;