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

Conflicts:
- `config/webpack/configuration.js`:
  Upstream updated the `js-yaml` dependency, which changed how to call it.
  Those changes conflicted because that code is pretty different in glitch-soc
  which has to deal with its more complex theming system.
  Proceeded to the same compatibility changes in glitch-soc's code.
- `package.json` and `yarn.lock`:
  Not really a conflict, just glitch-soc-specific dependencies textually too
  close to some dependencies updated upstream.

app/controllers/api/v1/accounts/featured_tags_controller.rb

@@ -7,7 +7,7 @@ class Api::V1::Accounts::FeaturedTagsController < Api::BaseController
   respond_to :json
 
   def index
-    render json: @featured_tags, each_serializer: REST::AccountFeaturedTagSerializer
+    render json: @featured_tags, each_serializer: REST::FeaturedTagSerializer
   end
 
   private