Removes github authentication controllers, Fixes Issue #2

Removes Github authentication controllers to make it integrated to the Red Hat BZ Infra
- Removes controller for the authService from controllers
- Removes authentication via github for the app services.
- Removes unwanted usage of authService in the app.js
- Removes the login button and post login navigation content showing the {{user.name}} 
- Removes github authentication related content in .env-dist
- Removes console logging of empty array on success of the onEmailChange

Signed off by : Sudheesh Singanamalla <ssingana@redhat.com>