Fixed Credit Input Form

removed input-group because the value of :amount was not been store on
the DDBB
Admin VS User environment

- Admins can view all resources
- User can only VIEW Credit & Merchants. Cannot create, edit or
destroy. Methods blocked by private methods on each controller file.
- Plus, Edit/Delete buttons removed from index & show columns & pages.
Changed profile page link

Instead of linking the header name to edit_user_registration created a
link to the currents user profile page.