Madness string 94297

Fixed misspelling of 'cahce' to 'cache', which was a critical bug that was breaking homepage. Then I removed cache completely. By the way, I haven't audited this code for security. In general, I would highly recommend against running PHP code on a public facing server. It's probably fine to run this (and mediawiki) on your local intranet disconnected from the internet (e.g. put it on a separate VLAN). Because the main use case of a blog is to have it not publicly facing.