- Accessible, usable docs are worth something in ROI
  - https://www.writethedocs.org/
  - https://read-the-docs.readthedocs.io/en/latest/
  - https://github.com/rtfd/readthedocs-docker-images/issues/47#issuecomment-485712800
    - Dockerfile that extends from readthedocs/build:latest (which has the GBs of latex necessary to run `make latexpdf` for all you PDF lovers out there)

- https://github.com/yoloseem/awesome-sphinxdoc
  - There are various Sphinx extensions for optionally including generated API docs for various languages
  - If you add the extensions you want installed to your requirements.txt or environment.yml, ReadTheDocs will install those for every build. You can also create (and maintain) a custom Docker image with all of the docs building dependencies installed (e.g. requirements_dev.txt and/or docs/requirements.txt)

- https://kernel.readthedocs.io/en/latest/kernel-documentation.html
  - This says "Copyright 2016"? That's set in conf.py

I keep a tools doc in ReST:
- https://westurner.github.io/tools/#sphinx
- https://westurner.github.io/tools/#docutils

I'll just CC those sections here
wrapped in a Markdown fenced code block

```rst

.. index:: Docutils
.. _docutils:

Docutils
~~~~~~~~~~~~~~~~~~~
| Homepage: http://docutils.sourceforge.net
| PyPI: https://pypi.python.org/pypi/docutils
| Docs: http://docutils.sourceforge.net/docs/
| Docs: http://docutils.sourceforge.net/rst.html
| Docs: http://docutils.sourceforge.net/docs/ref/doctree.html
| Docs: https://docutils.readthedocs.io/en/sphinx-docs/
| Docs: https://docutils.readthedocs.io/en/sphinx-docs/ref/rst/restructuredtext.html
| Src: svn http://svn.code.sf.net/p/docutils/code/trunk

Docutils is a :ref:`Python` library which 'parses" :ref:`ReStructuredText`
lightweight markup language into a doctree (~DOM)
which can be serialized into
HTML, ePub, MOBI, LaTeX, man pages,
Open Document files,
XML, JSON, and a number of other formats.


.. index:: Sphinx
.. _sphinx:

Sphinx
~~~~~~~~~~~~~~~~~
| Wikipedia: `<https://en.wikipedia.org/wiki/Sphinx_(documentation_generator)>`_
| Homepage: https://pypi.python.org/pypi/Sphinx
| Src: git https://github.com/sphinx-doc/sphinx
| Pypi: https://pypi.python.org/pypi/Sphinx
| Docs: http://sphinx-doc.org/contents.html
| Docs: http://sphinx-doc.org/markup/code.html
| Docs: http://www.sphinx-doc.org/en/stable/markup/inline.html#ref-role
| Docs: http://pygments.org/docs/lexers/
| Docs: http://thomas-cokelaer.info/tutorials/sphinx/rest_syntax.html
| Docs: https://github.com/yoloseem/awesome-sphinxdoc

Sphinx is a tool for working with
:ref:`ReStructuredText` documentation trees
and rendering them into HTML, PDF, LaTeX, ePub,
and a number of other formats.

[...]

```

FWIW, ReadTheDocs can host multiple versions of the docs according to the repo
tags you specify in the web admin.
There may be a way to use the RTD JS UI for selecting versions
with the docs hosted on your own server?
Such as https://www.kernel.org/doc/html/latest/

- https://github.com/torvalds/linux/blob/master/Documentation/conf.py
- https://github.com/torvalds/linux/blob/master/Documentation/Makefile

- https://github.com/torvalds/linux/blob/master/Documentation/doc-guide/index.rst
- https://github.com/torvalds/linux/blob/master/Documentation/doc-guide/sphinx.rst
- https://github.com/torvalds/linux/blob/master/Documentation/doc-guide/kernel-doc.rst

- https://www.kernel.org/doc/html/latest/
- https://www.kernel.org/doc/html/latest/doc-guide/
- https://www.kernel.org/doc/html/latest/doc-guide/sphinx.html#sphinx-install
- https://www.kernel.org/doc/html/latest/doc-guide/kernel-doc.html#writing-kernel-doc-comments