Eliminate dependency on docutils and sphinx. These are great projects, but they not friendly
to configure on and focused primarily toward internal code API documentation.

Today - markdown is more commonplace and supports extensions better than docutils does
and static site generators offer better inter-document linking than sphinx. For instance, gatsby
supports intuitive, structured, comprehensive, detailed, typed and recursive sources in graphql,
rather than the visitor pattern offered by docutils.

mkdocs, pdoc(3), and even non python documentation generators have a legitimate stakehold
in making documentation portable.

Other sphinx projects (e.g. flask, standard library python) can still be linked to intersphinx

Python package source

https://github.com/readthedocs/sphinx-autoapi +https://github.com/PyCQA/astroid

Generate gatsby source by parsing a package into a JSON / YAML structure
then into GraphQL

Intersphinx source

https://sphobjinv.readthedocs.io/en/latest/index.html

Parse objects.inv on projects into gatsby graphql source

MDX utilities to link to intersphinx sources

MDX utilities to link to python package sources