Move HomeViewController over to compositional collection views

[twostraws]

Right now the home view controller is built using a table view and a collection view embedded inside it, which is messy. With composition collection views this would be a lot less code, and would also us to size the badges at the end correctly – right now they basically never fit.

This would mean bumping our deployment target to 13.0.

[Carrione]

This issue can be closed.