Initial commit; add existing assets.
Update image URLs in obsolete stylesheets.
Add variant of v4 sans titlescreen background.
Copy and freeze prototype #4 (prerelease #1).
Change #header from position:fixed to absolute.
Make the titlescreen.png-less background default.
Delete extraneous references to the Ubuntu font.
Move screencaptures link to top of right column.
Add “Add-ons” #nav link.
Pare down strong_opaque-noshade border image.

Also ran optipng on `lite_opaque-noshade.png`.
Hide description text-wall behind expander.