Extract components to edit and add cards

This way we'll be able to reuse it in the SDG Management section while
reusing the `title` method to set the page title.

app/components/application_component.rb

@@ -1,3 +1,4 @@
 class ApplicationComponent < ViewComponent::Base
   include SettingsHelper
+  delegate :back_link_to, to: :helpers
 end