The domain is non-descriptive, and .info is typically associated with spam. It also looks like you're in a flux state of completion, with not a lot of detail. I'd suggest limited your scope and making a smaller, but more polished product, before trying to attract more contributors.

I picked this domain because I had hoped that when this book was complete, we could work on another. At the time I thought that it would be better if it was generic.

I started working on it but realized that I might put in hundreds of hours of work only to have nobody use it at all.