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

Conflicts:
	Dockerfile
	app/javascript/packs/common.js
	config/webpack/loaders/sass.js
	config/webpack/shared.js
	db/schema.rb
	package.json
	yarn.lock

A lot of the conflicts come from updating webpack.

Even though upstream deleted app/javascript/packs/common.js, I kept
glitch-soc's version as it unifies JS/CSS packs behavior across flavours.

Ported glitch changes to webpack 4.x

app/helpers/stream_entries_helper.rb

@@ -67,7 +67,7 @@ module StreamEntriesHelper
   end
 
   def acct(account)
-    if embedded_view? && account.local?
+    if account.local?
       "@#{account.acct}@#{Rails.configuration.x.local_domain}"
     else
       "@#{account.acct}"