feed-ubuntu.xml: Remove the Ubuntu feed
feed-ubuntu.xml: Remove the Ubuntu feed

I don't believe that this ever worked on Planet Ubuntu. Remove it
completely.

Signed-off-by: Tyler Hicks <e6fb06210fafc02fd7479ddbed2d042cc3a5155e@tyhicks.com>

tyhicks/tyhicks.github.io,tyhicks/tyhicks.github.io,tyhicks/tyhicks.github.io,tyhicks/tyhicks.github.io