Add about page

Change-Id: I49a5983d76f84fa451433d3fc135cf77dbc180db
Redesign main page to employ sidebar

Replaces top nav. Experimenting with the look of collapsibility.

Change-Id: I7e2a5cccb9986fc24df4d2c8f24d5b36ba3946e9
Merge branch 'master' into HEAD

Change-Id: I2b6a67ec9c6ef457da0ce37bf91518a4efa93d17
Merge "Merge branch 'master' into HEAD" into deployment