More composable forms (#989)

* Make forms more composable, opt-in to form builder

* Remove unused method

* Simpler money input controls

* Add in new form styling to imports

* Lint fixes

* Small tweak of multi select styles

app/controllers/application_controller.rb

@@ -2,8 +2,6 @@ class ApplicationController < ActionController::Base
   include Authentication, Invitable, SelfHostable
   include Pagy::Backend
 
-  default_form_builder ApplicationFormBuilder
-
   # Only allow modern browsers supporting webp images, web push, badges, import maps, CSS nesting, and CSS :has.
   allow_browser versions: :modern
 end