Admin login: hide

This is the first step related to #90 (closed)

Also, merging this bring us one step closer to going live with the application for lottery form

EDIT: For now /login is used as an admin login, which we are going to move to /admin (provided by another web application).

At the same time we are going to need the same logic for user login. Normally, I'd remove everything and then put it back when the time comes for the user login. But in this case, there's a lot of code in place which are going to need really soon.

Therefore, I decided to hide /login for now, until we change it to user login.