Merge commit '3554c527954441fd924586a49c7d99a89101ac7e' into glitch-soc/merge-upstream

Conflicts:
- `app/controllers/authorize_interactions_controller.rb`:
  Small conflict due to our theming system.
- `streaming/index.js`:
  Upstream refactored part of the streaming server.
  We had some extra logic for handling local-only posts.
  Applied the refactor.

app/views/layouts/helper_frame.html.haml

@@ -0,0 +1,8 @@
+!!! 5
+%html
+  %head
+    %meta{ charset: 'utf-8' }/
+
+    = javascript_pack_tag 'common', crossorigin: 'anonymous'
+
+    = yield :header_tags