3909 Standardize use of navigation class on actions

https://code.google.com/p/otwarchive/issues/detail?id=3909

Use the navigation class only on major navigation items (leave it on header/dashboard/footer items, make sure it's on the subnavigation, remove it from anywhere else). Now we can make the site prettier in the future!

The only CSS change here was swapping the class name we use on the Hide/Edit options we show to admins.

Yeah, I know this is going to sit for a while. :P