Me too.

I use make together with a markdown compiler, and the m4 preprocessor, to keep devdocs up to date, in one huge document, where everything is included, and the various sections as stand-alone docs. The markdown version of the section files is almost uncluttered from m4 and html. I link from any external doc to any other via links in the toc in the main doc index.html, to keep everything as simple as possible. It's sweet.