Navigation for / and /top/:page should highlight the "top" tab in header

[kristoferbaxter]

I don't see a way to pass a custom method to <NavLink> from React-Router for denoting it's active classes.

Idea 1:
Use a custom <Match> component to derive when either url pattern is matched and apply via standard classNames

Idea 2:
Modify React-Router to accept custom methods for determining active states.

Idea 3:
Move away from React-Router entirely and implement a custom router. (Likely don't have time for this).