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

Conflicts:
- `README.md`:
  Upstream updated its README, while we have a completely different one.
  Kept our README.
- `app/controllers/concerns/web_app_controller_concern.rb`:
  Conflict because of glitch-soc's theming system.
  Additionally, glitch-soc has different behavior regarding moved accounts.
  Ported some of the changes, but kept our overall behavior.
- `app/javascript/packs/admin.js`:
  Code changes actually applied to `app/javascript/core/admin.js`

public/inert.css

@@ -3,7 +3,8 @@
   cursor: default;
 }
 
-[inert], [inert] * {
+[inert],
+[inert] * {
   user-select: none;
   -webkit-user-select: none;
   -moz-user-select: none;