It would make sense to have it hosted in this repo, with separated gh-pages branch, containing basic info and communication channels (IRC, Slack links, etc) and link to Github repository itself.
At the very bottom, there is a link to a test fest website, but not the current one. Although this isnt directly tied to this website, it would be good to have that link updated. Perhaps someone with enough karma on the PHP Wiki can do it?
It would be fine if it create a complete .phpt file from scratch as a template, then the users could start to write their own tests on top of that generated file.