Using the new Section plugin from Mohammad, here is a long form tiddler that attempts to explain how to use update TiddlyWiki documentation using your own local Git repository. It needs a better title, among other things. Probably there are horrific errors as well.
I originally wanted to write something to use at TiddlyWiki itself, but realized that this material was probably too long to go there.
How to use, maintain, and update node.js based documentation of TiddlyWiki with Git/Github