Finalized theme loading and stuff

app/controllers/about_controller.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 class AboutController < ApplicationController
+  before_action :set_pack
   before_action :set_body_classes
   before_action :set_instance_presenter, only: [:show, :more, :terms]
 
@@ -21,6 +22,10 @@ class AboutController < ApplicationController
 
   helper_method :new_user
 
+  def set_pack
+    use_pack action_name == 'show' ? 'about' : 'common'
+  end
+
   def set_instance_presenter
     @instance_presenter = InstancePresenter.new
   end