I ended up using apidoc, which was almost exactly was I was looking for : a really simple tool reading some annotations in my code and generating some html documentation.
Thanks all for the propositions, much appreciated!
I agree with the first 3 points.
I think the 4th one is less of a priority for now, but it will probably be a good idea as soon as people will start posting source code in comments.
Thanks for the ideas, and feel free to share if you have some more ;)
Interesting, my results :
CanvasMark Score: 14351 (Chrome 25 on Mac)
CanvasMark Score: 8327 (Firefox 19 on Mac)
and
CanvasMark Score: 10762 (Chrome 25 on Mac) after closing a bunch of tabs