I think I read somewhere that there might be a plan to host the documentation once the asciidoc efforts gathers additional momentum. That will be very nice, I think
I would also consider pulling the code from github and navigating around it on your machine locally with an editor of your choice. If you don’t have a preference in this area I think the flavor of choice atm might be visual studio code. A decent editor should make it much easier for you to jump between tags, etc vs accessing the code via github (at least none of the browser plugins people suggest for navigating code on github seem to have worked well for me).
It takes a bit of an extra effort to learn the ropes of the editor but I think in the longer run the effort is well worth it.