http://en.wikipedia.org/wiki/Urban_planescape
This is the Urban Planescape Wikipedia article I just submitted. As you can see, it's really dodgy and probably needs some work, but it's really just a placeholder for you guys to go at it. Remember: it's a brief discription of UPS, not a free hosting service.
According to the deletion log: the page you linked to does not exist as of now, and it was likely deleted by an administrator. The same thing happened to me when I made a few pages about the Serena Dawn Spaceport and Damnatus. I am really sorry for your loss, but Wikipedia does not appear to have a particular like for fan-based projects except in the form of fansite links. I would recommend creating your own PS-based wiki at http://www.wikia.com/.