Fixed Chairman's video for playback under Linux

Affects screensaver and main page usage. Transcoded video to WebM using
Miro Video Converter.
Grr
Merge remote-tracking branch 'origin/6d6163' into Tim
deleted main.html
Merge remote-tracking branch 'origin/Tim'
Merge branch 'master' of https://github.com/posixoddity/kiosk-two-point-oh