CSS Major updates

This is a major revision of the top level navigation in the top bar and apps.

Top Bar
* Increase height and logo size
* Moved language selector to be always visible

App Bar
* All apps in a group are shown in a new toolbar below the topbar
* All app level actions are now within the actions dropdown on the right of the app bar
* User Manual is available after the actions dropdown

Side Bar
* Width reduced to give more space to main content area
* Any action links migrated to the action dropdown
* Now to be only used for collection listing