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

Conflicts:
- `README.md`:
  Upstream updated copyright year, we don't mention it so kept our version.
- `app/controllers/admin/dashboard_controller.rb`:
  Not really a conflict, upstream change (removing the spam checker) too close
  to glitch-soc changes. Ported upstream changes.
- `app/models/form/admin_settings.rb`:
  Same.
- `app/services/remove_status_service.rb`:
  Same.
- `app/views/admin/settings/edit.html.haml`:
  Same.
- `config/settings.yml`:
  Same.
- `config/environments/production.rb`:
  Not a real conflict, upstream added a default HTTP header, but we have
  extra headers in glitch-soc.
  Added the header.

app/views/admin/dashboard/index.html.haml

@@ -79,8 +79,6 @@
           = feature_hint(link_to(t('admin.dashboard.trends'), edit_admin_settings_path), @trends_enabled)
         %li
           = feature_hint(link_to(t('admin.dashboard.feature_relay'), admin_relays_path), @relay_enabled)
-        %li
-          = feature_hint(link_to(t('admin.dashboard.feature_spam_check'), edit_admin_settings_path), @spam_check_enabled)
 
   .dashboard__widgets__versions
     %div