New Getting Started page

@thomasgohard 
Here is the new Getting Started along with edits I made based on some of Paul's comments in the old pull request. I also edited the background for the breadcrumbs which I forgot to do in the menu-footer-colours pull request. Now the background is white to follow with the rest of the white background of the site. 


Does this really add anything for the end-user? It just re-iterates the information conveyed by the titles of the three steps. I think we can remove this entirely.