made a start at adding an 'invoice-me' button on home page to encourage companies to donate
removed alert() that was accidentally left in
switched about button so it links to about page on the cyber-dojo blog - do rest later
merge the two tag lines 'the place to practice' and 'programming' into a single line so cyber-dojo.org and its blog site look more similar
deleted dead dialog html now about is on blog.cyber-dojo.org
CSS polish for the please-invoice-me button
work on fixing forking via html URL embedded on web page (rather than via ajax json from fork button in diff dialog)