Update header design

[BrandonKlotz]

Thoughts on updating the design on the header with the GR Parks logo and color scheme?

[joel6653]

They were originally grabbed for convenience from the city's own logo, so I'm open to anything. Just need to keep header as small as possible, since the map itself needs to dominate the interface. Sidebar colors are open to improvement, too. As for typography, we are somewhat restricted by what is already used in the map, but otherwise ... ? Bottom line, have at it.