Nice MVP. I like the idea of using git behind it, that is novel and makes 'owning' the data easy. Could be the killer feature.

Other comments:\n- what is with the speckled grey textured background? Oy, are we back in 1997? Terrible!

- if I actually used this, I'd want to brand the page a bit to make it look how I want, I didn't see any template to edit.

- multiple owners and having users there is very cool, as is logging in via github. (and automatically claiming the subdomain off the github user)

Anyways, keep it up, I think there is demand for a reasonably priced wiki for sure.