create a list of things to work on

[mattkatz]

I'd be happy to do some small chunks of work on this - but it isn't clear what I can do to help.
If there were a list of issues, like "port chapter X to markdown" or "extract images from chapter y", I think these are things that people could help out with a little bit at a time. As is, I'm not sure how to assist. I got here by seeing the note welcoming contributions.

Even a section of the doc listing that incomplete parts would be helpful as we could submit pull requests with a part completed and that section removed from the list...