More site fixes

Spent part of today fixing more things with this site. I figured out that it's possible to have static "pages" just like WordPress, so I've added one of those ("About").

I also fixed the default CSS ("nomyidea") to work with narrow browser windows. Took about an hour to figure out how, which serves as a bit of a reminder why I don't work with webdev :) Had to change widths to max-widths and fiddle with line-heights, margins and paddings.