cleanup: unused abstract url helper for page `items`

app/helpers/common/page/url_helper.rb

-# We have a very flexible but yet restful routes for page items.
-# They allow specifying the controller while still having the default
-# restful properties and creating the normal named routes.
-#
-# It's a bit cumbersome though to always specify the page and the controller.
-# So we add meaningful defaults to the named_route helpers here.
-#
-# What are meaningful defaults? Most page types have at least two controllers.
-# One for the page itself and one for its items. So we want the second one.
-# In order for this to work you have to make sure though the default controller
-# for the items is listed at the second position in the init.rb file of the page.
-#
-# We only use the _url helpers for these - not the _path ones.
-# Why?
-# because the url includes https as the protocol. So even if the html snippet
-# get's displayed out of context it will not initiate an unencrypted connection
-# by accident. We can discuss this choice though.
-#   *azul
-
-module Common::Page::UrlHelper
-  def sort_page_items_url(*args)
-    add_page_item_defaults_to_args! args
-    super
-  end
-
-  def page_items_url(*args)
-    add_page_item_defaults_to_args! args
-    super
-  end
-
-  def page_item_url(*args)
-    add_page_item_defaults_to_args! args
-    super
-  end
-
-  def edit_page_item_url(*args)
-    add_page_item_defaults_to_args! args
-    super
-  end
-
-  def add_page_defaults_to_args!(args)
-    if @page.present?
-      # use the default item controller not the main one
-      controller = @page.controller
-      add_defaults_to_args! args, page_id: @page, controller: controller
-    end
-  end
-
-  def add_page_item_defaults_to_args!(args)
-    if @page.present?
-      # use the default item controller not the main one
-      controller = @page.controllers.second || @page.controller
-      add_defaults_to_args! args, page_id: @page, controller: controller
-    end
-  end
-
-  def add_defaults_to_args!(args, defaults = {})
-    arg_options = args.extract_options!
-    arg_options.reverse_merge! defaults
-    args << arg_options
-  end
-end