Home page updates / Content page build

Added to Home page
+ help subnav hover divs
+ text-decoration to text links

Created Content page, added
+ banner image(s)
+ sub-nav sidebar
+ sidebar ad space
+ main content container

Removed
- isotope.js (no longer needed)
- isotope.css (no longer needed)

Signed-off-by: Chris Allison <callisonification@gmail.com>