Sphinx is a documentation generator using reStructuredText:

https://www.sphinx-doc.org/en/master/index.html
https://www.sphinx-doc.org/en/master/usage/restructuredtext/index.html

This builds out the initial skeleton of the documentation.  Changes
can be tested by running make in the documentation tree:

 $ cd doc2
 $ make html

The generated pages are available at

 doc2/_build/html/index.html

This also include gitlab CI to build the documentation at publish it
at the gitlab documentation pages:

 https://cds.docs.ligo.org/advligorts/