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.

app/javascript/mastodon/initial_state.js

@@ -3,6 +3,7 @@ const initialState = element && JSON.parse(element.textContent);
 
 const getMeta = (prop) => initialState && initialState.meta && initialState.meta[prop];
 
+export const domain = getMeta('domain');
 export const reduceMotion = getMeta('reduce_motion');
 export const autoPlayGif = getMeta('auto_play_gif');
 export const displayMedia = getMeta('display_media');
@@ -14,6 +15,7 @@ export const me = getMeta('me');
 export const searchEnabled = getMeta('search_enabled');
 export const maxChars = (initialState && initialState.max_toot_chars) || 500;
 export const limitedFederationMode = getMeta('limited_federation_mode');
+export const registrationsOpen = getMeta('registrations_open');
 export const repository = getMeta('repository');
 export const source_url = getMeta('source_url');
 export const version = getMeta('version');
@@ -27,5 +29,6 @@ export const title = getMeta('title');
 export const cropImages = getMeta('crop_images');
 export const disableSwiping = getMeta('disable_swiping');
 export const languages = initialState && initialState.languages;
+export const server = initialState && initialState.server;
 
 export default initialState;