Commit 1

Cut assets: export missing assets, cut polaroid 4/5 and paper
background + shadow. Re-export polaroid 1/2/3 as png’s. All assets
exported as png’s to support responsive wood panel background due to
non-rectangular shapes with shadows.

Cleaned up HTML file and wiped out body content. Wiped out main.css.
Coded responsive background image. Began coding responsive polaroid
images, max-width/height thresholds not yet specified.