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

Conflicts:
- `app/javascript/mastodon/features/compose/components/poll_form.js`:
  glitch-soc change because of having changed the default number of
  available poll options.
  Applied upstream's changes while keeping glitch-soc's default number of
  poll options.
- `public/oops.png`:
  We had a minor graphics change, probably not worth diverging from upstream.
  Took upstream version.

app/views/layouts/application.html.haml

@@ -23,7 +23,6 @@
     %link{ rel: 'manifest', href: manifest_path(format: :json) }/
     %meta{ name: 'theme-color', content: '#191b22' }/
     %meta{ name: 'apple-mobile-web-app-capable', content: 'yes' }/
-    %meta{ name: 'apple-itunes-app', content: 'app-id=1571998974' }/
 
     %title= content_for?(:page_title) ? safe_join([yield(:page_title).chomp.html_safe, title], ' - ') : title