Add Blinkables, BlinkyTube POV blinkable

Also:
* give links some color (secondary _GB, RG_, R_B :))
* clean up some whitespace in index.html
Add preview image for POV blinkable
Merge branch 'master' into blinkable-blinkytube-pov
Split projects into exhibits and hardware
Show hardware/exhibits on main. Reorder hardware.
First pass of PatternPaint docs
More PatternPaint docs.  WIP.
Tighten up PatternPaint doc. Add Nyan images.
PatternPaint doc tweak
NyanCat is NYAAAAAAAAAAAAAAAAAN
Text before Nyan
Fix PatternPaint source link :P
Move /patternpaint under software. Add preview img.
Initial DiscoParty doc. Needs imgs and tech deets.
"Exhibits" => "Installations"
Add intro video to BlinkyTape page
Add info links to blinkytape demo listings
blinkyboard repo now BlinkyTape repo! What!