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

Conflicts:
- README.md
  discarded upstream changes
- app/controllers/api/v1/bookmarks_controller.rb
  finally merged upstream, some code style fixes
  and slightly changed pagination code
- app/controllers/application_controller.rb
  changed upstream to always return HTML error pages
  slight conflict caused by theming code
- app/models/bookmark.rb
  finally merged upstream, no real conflict
- spec/controllers/api/v1/bookmarks_controller_spec.rb
  finally merged upstream, slightly changed pagination code

app/javascript/styles/mastodon/components.scss

@@ -1592,6 +1592,10 @@ a.account__display-name {
   color: $gold-star;
 }
 
+.bookmark-icon.active {
+  color: $red-bookmark;
+}
+
 .no-reduce-motion .icon-button.star-icon {
   &.activate {
     & > .fa-star {

app/javascript/styles/mastodon/variables.scss

@@ -6,6 +6,8 @@ $error-red: #df405a !default;        // Cerise
 $warning-red: #ff5050 !default;      // Sunset Orange
 $gold-star: #ca8f04 !default;        // Dark Goldenrod
 
+$red-bookmark: $warning-red;
+
 // Values from the classic Mastodon UI
 $classic-base-color: #282c37;         // Midnight Express
 $classic-primary-color: #9baec8;      // Echo Blue