Moved "Admin" inside navigation
Moved "Admin" inside navigation

- app/views/layouts/_header.html.erb - Moved admin menu item under
  user menu item for desktop & mobile navigation

Updates #997

EBWiki/EBWiki,BOWiki/BOW,BOWiki/BOW,EBWiki/EBWiki,EBWiki/EBWiki,EBWiki/EBWiki,BOWiki/BOW