Fixes the some some sizing stuff in the slider (WIP). #5
Moves most of the categories controller into admin. #7

- There is now just an index action for categories.
Admin Dashboard view (WIP).
Moves CRUD for categories into admin. #7
Auto add spacing after document.
Routes for categories. #3

- Only index is viewable outside admin.
Auto generated categories controller test.
Admin categories index view (WIP). #7