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

Conflicts:
- `app/controllers/activitypub/collections_controller.rb`:
  Conflict due to glitch-soc having to take care of local-only
  pinned toots in that controller.
  Took upstream's changes and restored the local-only special
  handling.
- `app/controllers/auth/sessions_controller.rb`:
  Minor conflicts due to the theming system, applied upstream
  changes, adapted the following two files for glitch-soc's
  theming system:
  - `app/controllers/concerns/sign_in_token_authentication_concern.rb`
  - `app/controllers/concerns/two_factor_authentication_concern.rb`
- `app/services/backup_service.rb`:
  Minor conflict due to glitch-soc having to handle local-only
  toots specially. Applied upstream changes and restored
  the local-only special handling.
- `app/views/admin/custom_emojis/index.html.haml`:
  Minor conflict due to the theming system.
- `package.json`:
  Upstream dependency updated, too close to a glitch-soc-only
  dependency in the file.
- `yarn.lock`:
  Upstream dependency updated, too close to a glitch-soc-only
  dependency in the file.

app/views/about/more.html.haml

@@ -55,12 +55,15 @@
             %p= t('about.unavailable_content_html')
 
             - if (blocks = @blocks.select(&:reject_media?)) && !blocks.empty?
+              %h3= t('about.unavailable_content_description.rejecting_media_title')
               %p= t('about.unavailable_content_description.rejecting_media')
               = render partial: 'domain_blocks', locals: { domain_blocks: blocks }
             - if (blocks = @blocks.select(&:silence?)) && !blocks.empty?
+              %h3= t('about.unavailable_content_description.silenced_title')
               %p= t('about.unavailable_content_description.silenced')
               = render partial: 'domain_blocks', locals: { domain_blocks: blocks }
             - if (blocks = @blocks.select(&:suspend?)) && !blocks.empty?
+              %h3= t('about.unavailable_content_description.suspended_title')
               %p= t('about.unavailable_content_description.suspended')
               = render partial: 'domain_blocks', locals: { domain_blocks: blocks }