Rename "about" page to "status", change "about" link to Kitware page
Emphasize the navbar's login button more
Fix bug to ensure "sessions" toolbar button is highlighted when active
Remove a stray character
Rename "Slide Atlas" -> "SlideAtlas" and make headings more consistant
Only display Admin button if logged in

This should eventually be changed to only display if the current user has
administrative privileges.
Merge branch 'page_ui_refinements'

* page_ui_refinements:
  Only display Admin button if logged in
  Rename "Slide Atlas" -> "SlideAtlas" and make headings more consistant
  Remove a stray character
  Fix bug to ensure "sessions" toolbar button is highlighted when active
  Emphasize the navbar's login button more
  Rename "about" page to "status", change "about" link to Kitware page