Fix and clear code as the promotion changeset possible only via CV's

1) changest.clj line 132 and 133 , sleep and refresh required due to timing issues. 
Please suggest if there is a better way.
2) Removed unnecessary protocol  Promotable and it's related functionality as there is now only 1 entity that is Content-view.
3) The ::content-views-category is no longer required and the navigation fails and hence this fix PR.