I have prepared a dash/zeal port of our documentation here. Please take a look and if it's good, we can open a pull request.
There's also DevHelp which looks nice. Also the python doc is available for that tool. The python doc for devhelp has been generated via sphinx (which has a native option for devhelp output). Should be quite easy to generate this doc for devhelp, but it will have to be distributed through the debian/ubuntu repositories. I don't know if this is good for us. IMHO I would say yes.