Back button AND MOOOORE!

Previously if you hit the landing page, clicked "View more", clicked on a badge to see the badge page, then clicked the browser Back button, you would return to the landing page showing only the initial 2 rows of badges.

This PR does two things: now when you hit "View more", the url updates to indicate the number of badges displayed on the screen so if you use the back button, you get to see all the badges you were previously looking at. It also changes the initial landing page view to show 4 rows of badges (16 badges).