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

Conflicts:
- app/controllers/admin/base_controller.rb
  Some refactoring made upstream, no real conflict.
- app/javascript/mastodon/features/compose/components/compose_form.js
  Updated using upstream's code but using maxChars instead of the
  hardcoded length of 500 characters per toot.
- app/javascript/styles/mastodon/components.scss
  Upstream redesigned the onboarding modal. Not sure why we had a
  conflict there.

app/controllers/directories_controller.rb

@@ -37,22 +37,12 @@ class DirectoriesController < ApplicationController
   end
 
   def set_accounts
-    @accounts = Account.searchable.discoverable.page(params[:page]).per(50).tap do |query|
+    @accounts = Account.discoverable.page(params[:page]).per(30).tap do |query|
       query.merge!(Account.tagged_with(@tag.id)) if @tag
-
-      if popular_requested?
-        query.merge!(Account.popular)
-      else
-        query.merge!(Account.by_recent_status)
-      end
     end
   end
 
   def set_instance_presenter
     @instance_presenter = InstancePresenter.new
   end
-
-  def popular_requested?
-    request.path.ends_with?('/popular')
-  end
 end