Added styles for vertical navbar
Changing template url to relative one
Adding fluid layout for vertical navbar
Correcting footer positioning with new layout
Added close button to expanded rows
Added mock activity and guide to cardstack
Default state of cardstack is expanded; added close button to expanded cardstack
Merge changes made in branch 'feature/vertical-nav'
Changes:
 - Cardstack content and functionality

Conflicts:
	public/views/lessonbrief.html