docs: def get_content_models(self):
          """
          Return all Page subclasses that are admin registered, ordered
          based on the ``ADD_PAGE_ORDER`` setting.
          """
          models = super(PageAdmin, self).get_content_models()
  
          order = [name.lower() for name in settings.ADD_PAGE_ORDER]
  
          def sort_key(page):
              name = "%s.%s" % (page._meta.app_label, page._meta.object_name)
              unordered = len(order)
              try:
                  return (order.index(name.lower()), "")
              except ValueError:
                  return (unordered, page.meta_verbose_name)
          return sorted(models, key=sort_key)