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

Conflicts:
- `app/controllers/home_controller.rb`:
  Upstream made it so `/web` is available to non-logged-in users
  and `/` redirects to `/web` instead of `/about`.
  Kept our version since glitch-soc's WebUI doesn't have what's
  needed yet and I think /about is still a much better landing
  page anyway.
- `app/models/form/admin_settings.rb`:
  Upstream added new settings, and glitch-soc had an extra setting.
  Not really a conflict.
  Added upstream's new settings.
- `app/serializers/initial_state_serializer.rb`:
  Upstream added a new `server` initial state object.
  Not really a conflict.
  Merged upstream's changes.
- `app/views/admin/settings/edit.html.haml`:
  Upstream added new settings.
  Not really a conflict.
  Merged upstream's changes.
- `app/workers/scheduler/feed_cleanup_scheduler.rb`:
  Upstream refactored that part and removed the file.
  Ported our relevant changes into `app/lib/vacuum/feeds_vacuum.rb`
- `config/settings.yml`:
  Upstream added new settings.
  Not a real conflict.
  Added upstream's new settings.

spec/models/follow_request_spec.rb

@@ -7,7 +7,7 @@ RSpec.describe FollowRequest, type: :model do
     let(:target_account) { Fabricate(:account) }
 
     it 'calls Account#follow!, MergeWorker.perform_async, and #destroy!' do
-      expect(account).to        receive(:follow!).with(target_account, reblogs: true, notify: false, uri: follow_request.uri, bypass_limit: true)
+      expect(account).to        receive(:follow!).with(target_account, reblogs: true, notify: false, uri: follow_request.uri, languages: nil, bypass_limit: true)
       expect(MergeWorker).to    receive(:perform_async).with(target_account.id, account.id)
       expect(follow_request).to receive(:destroy!)
       follow_request.authorize!