fix(config) - Fix routing error in config.rb

Fix for Runtime error:

    You should not use the `match` method in your router without specifying an HTTP method.

by replacing match with get and post methods
fix(router) - Remove reference to ghost controllers in router

routes.rb contained reference to ghost controller; course_list_item

course_references_controller is not used in the admin panel. Removing it.
fix(router) - Fix missing :controller (ArgumentError)