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/serializers/rest/account_featured_tag_serializer.rb

@@ -1,15 +0,0 @@
-# frozen_string_literal: true
-
-class REST::AccountFeaturedTagSerializer < ActiveModel::Serializer
-  include RoutingHelper
-
-  attributes :id, :name, :url
-
-  def id
-    object.tag.id.to_s
-  end
-
-  def url
-    short_account_tag_url(object.account, object.tag)
-  end
-end

app/serializers/rest/featured_tag_serializer.rb

@@ -1,9 +1,15 @@
 # frozen_string_literal: true
 
 class REST::FeaturedTagSerializer < ActiveModel::Serializer
-  attributes :id, :name, :statuses_count, :last_status_at
+  include RoutingHelper
+
+  attributes :id, :name, :url, :statuses_count, :last_status_at
 
   def id
     object.id.to_s
   end
+
+  def url
+    short_account_tag_url(object.account, object.tag)
+  end
 end