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

Conflicts:
- `Gemfile.lock`:
  No real conflict, glitch-soc-only dependency (redcarpet) too close to an
  upstream one (rdf-normalize)
- `README.md`:
  we have different READMEs, discarded upstream's changes
- `app/views/admin/custom_emojis/index.html.haml`:
  No real conflict, different context because of glitch-soc theming
- `lib/mastodon/statuses_cli.rb`:
  Upstream added code to keep bookmarked statuses, we were already doing so
  with slightly different code. Discarded upstream's changes.
- `package.json`:
  No real conflict, glitch-soc-only dependency (favico.js) too close to
  an upstream one

app/views/admin/reports/show.html.haml

@@ -1,7 +1,7 @@
 - content_for :page_title do
   = t('admin.reports.report', id: @report.id)
 
-- content_for :page_heading_actions do
+- content_for :heading_actions do
   - if @report.unresolved?
     = link_to t('admin.reports.mark_as_resolved'), resolve_admin_report_path(@report), method: :post, class: 'button'
   - else