remove redirect for wiki.willnorris.com

since I how use HSTS with subdomains and I've never had a cert for
wiki.willnorris.com, modern browsers won't follow this redirect at all,
so no point in having it.
remove left margin on post list
remove explicit img sizes in several posts
css improvements

mostly improvements around floating and resizing images in posts to make
them handle different screen sizes better
minor rewording of about page