CSS: A2.0 Skin Addendum for Tag Guidelines

re: https://code.google.com/p/otwarchive/issues/detail?id=3467

This adds three classes to the 16-zone-system.css in their own new zone to allow for content formatting on the Tag Guidelines pages.

NB: The code has been tested in a closed location but not on a webdav. My system is having issues acknowledging changes to CSS. Again.