Fix issue 2864 with incorrect URLs for front end docs in CSS files

The stylesheets contain comments directing people to our front end docs. The link for the preface docs was broken, there was no link for interactions, and all the URLs pointed to redirects because I didn't update the files in a timely manner after we moved our front end docs to github pages  http://code.google.com/p/otwarchive/issues/detail?id=2864