This is a fork of the GNOME/gjs-documentation with pre-generated and possibly updated documentation directly in the html folder or via gh-pages
Since it took 5 days to me to figure out how to build GJS documentation, I thought it would have been easier to have a pre-published repository instead of going through the whole jhbuild process ... however ...
In my case this post followed step by step was the only way to have jhbuild working as expected.
Moreover, there is an AUR jhbuild package that maybe works for you, it didn't in my case.
The most important bit was to specify the right prefix. As example, following the first post this is the way to actually build this documentation (you need basically the entirity of GNOME modules already built though)
BASE=~/Devel/gnome/runtime/usr && $BASE/bin/jhbuild run make prefix=$BASE