Change color of facets labels and "show more" so they're more noticeable

DLG is thinking change the facet labels to a darker color. Perhaps the blue color that the "search" bkgd is using, but not as bright? So blue bkgd and white text as a starting point. Maybe we can do some mock-ups.

This came out of this suggestions doc, presented at the July 7th DLG dev check-in:

Suggestions: https://docs.google.com/document/d/1vZWgPdDebtltwd5y65rn7gNllNg_b2c0vbAyVA7rea8/edit?usp=sharing