Adjust the the layout of the category tiles, including font size and color.

Screenshot: https://screenshot.googleplex.com/7xzErwj8uKS.png
UX deck: https://docs.google.com/presentation/d/15JadcGi5k1_0znUN_XdFpU7UxeXwxjK3Y7LxvhW5ETM/edit?ts=5e7828e0#slide=id.g7cc7612850_7_39

Bug: 152201119
Change-Id: I6ff8518ee77dd976881f5f8fedc90a7bff3a3d43
5 files changed