Moved styles for kbMenuToggler into navbar.less

Didn't really make sense to keep that one out of navigation?
Bugfix: Corrected kbMenuToggler right alignment to always follow right side of content.
Added 3 images from Helle for the header (more to come?).
Bugfix: Set top navigationbar bg color to white.
Refactor: Simplified topnavigation logo and logotype.