I see that this is a honorable goal, but in this particular project the source looks more like source than documentation. An extreme example is this part, where the code even contains function docstrings, rather than having the docstring as part of the surrounding document:

https://github.com/thi-ng/geom/blob/master/geom-core/src/mat...

This is an effect which I observed with my own literate programming attempts, too: They quickly end up with large documents that contain lots of code listings and not much explaination.