Just noticed there's a docs directory with a makefile. So after "cd docs" and trying to "make html" I get:
$ make html
sphinx-build -b html -d build/doctrees source build/html
Running Sphinx v1.8.5
Could not import extension sphinxcontrib.rsvgconverter (exception: No module named 'sphinxcontrib')
make: *** [Makefile:50: html] Error 2
I'm running ubuntu and did a
"sudo apt install sphinxsearch" and
"sudo apt install sphinx-common"
"sudo apt install python3-sphinx"
What else do I need?