Save about 250kb from page load by optimizing images.

All images loaded where very simple colors and could easily be converted to PNG-8 and re-saved
without any noticeable loss of quality.

Images all contained significant Adobe Fireworks metadata which contributed to their
surprisingly large size. Discarding that metadata allowed us to, for example, reduce
bg.png from 53kb to 2kb.

Added an additional solid background color as bg.png is honestly nearly unnoticeable on most
consumer displays.