Action Text generator can now rely on Propshaft (rails#52918)

* Action Text generator can now rely on Propshaft

Author: dhh

actiontext/lib/generators/action_text/install/install_generator.rb

@@ -36,20 +36,8 @@ def append_javascript_dependencies
       end
 
       def create_actiontext_files
-        destination = Pathname(destination_root)
-
         template "actiontext.css", "app/assets/stylesheets/actiontext.css"
 
-        unless destination.join("app/assets/application.css").exist?
-          if (stylesheets = Dir.glob "#{destination_root}/app/assets/stylesheets/application.*.{scss,css}").length > 0
-            insert_into_file stylesheets.first.to_s, %(@import 'actiontext.css';)
-          else
-            say <<~INSTRUCTIONS, :green
-              To use the Trix editor, you must require 'app/assets/stylesheets/actiontext.css' in your base stylesheet.
-            INSTRUCTIONS
-          end
-        end
-
         gem_root = "#{__dir__}/../../../.."
 
         copy_file "#{gem_root}/app/views/active_storage/blobs/_blob.html.erb",