[PD-878] Differentiate current page in right nav

- inverting colors won't work since there is an image gradient
- @galitskyd helped me try a few variations (including hiding the gradient) and those all looked sub-optimal
- Given when I originally posted this issue, my concern was clicking on a button for a page that I was already on, I just hide the current page. As for knowing which page a person is on, the page title could be renamed to be more descriptive where insufficient.

@fezick: I asked for an alternative, but didn't get an answer, so made an executive decision. This is up on my server if you want to take a look at the results in order to make an informed decision.