Slartboz: Bumping Demo Vid Debut to July 31

Slartboz is bumping the target debut of our 1st demo video to... July 31

will give us more time to make it beefier, more fun and polished before seen by public for the 1st time

my dev loop, per day or session:

 * add 3-20 things TODO

 * reprioritizing pass (eg. issue triage)

 * code, build, play, tweak

 * executing on & finishing 1-5 of things in TODO

 * if/when "comfortable enough": (ie. fark it, ship!)

 1. cut a demo vid (screencast of actual play)

 2. share it online

 3. restart loop