Split the docs

[ni-jfitzger]

• [X] This contribution adheres to CONTRIBUTING.md.
• ~[ ] I've updated CHANGELOG.md if applicable.~
• ~[ ] I've added tests applicable for this pull request~

What does this Pull Request accomplish?

To have different readthedocs pages for each of the driver modules in nimi-python. Clients don't care about nimi-python, they pip install nidmm (or some other module) and would expect to find the documentation for nidmm not nimi-python.

This change also paves the road toward individual nimi-python packages to maintain independent versions, following semver guidance, and release independently. This will allow patch-fix releases to be made more easily.

Major Changes:

• Split the docs to be generated for individual packages
  • Updated conf.py to use module-specific versions and generate inside docs/module/
  • Moved docs/<module>.rst into module-specific folders, and began generating them from driver.rst.mako (because tox -e clean deletes that folder
  • Updated include paths as needed
  • Split docs/index.rst into docs/<module>/index.rst files generated from a template.
  • Updated include paths as needed.
  • Deleted extra information that was not useful and reorganized the document.
    • In particular, replaced use of docs/_static/about.inc with new docs/_static/about_driver.inc, removing implementation details and rewording some things.
  • Split LATEST_RELEASE file used by examples.rst into individual files inside src/<module>/
  • Deleted now unused VERSION file that conf.py was using
  • Updated tox.inis to call sphinx-build for each conf.py
• Setup new ReadTheDocs projects for each package. Docs built from this PR:
  • https://nidcpower--1963.org.readthedocs.build/en/1963/
  • https://nidigital--1963.org.readthedocs.build/en/1963/
  • https://nidmm--1963.org.readthedocs.build/en/1963/
  • https://nifgen--1963.org.readthedocs.build/en/1963/
  • https://nimodinst--1963.org.readthedocs.build/en/1963/
  • https://niscope--1963.org.readthedocs.build/en/1963/
  • https://nise--1963.org.readthedocs.build/en/1963/
  • https://niswitch--1963.org.readthedocs.build/en/1963/
  • https://nitclk--1963.org.readthedocs.build/en/1963/
  • Setup .readthedocs.yaml files to configure the projects from our repo
• Changed documentation for original ReadTheDocs project into a redirector to help users find the version of the docs they're looking for
  • This is what users will view for the 'latest' or 'master' version of the documentation.

    List issues fixed by this Pull Request below, if any.

• Fix #1965

What testing has been done?

See the links to the built documentation.

TODOs

• Intersphinx mapping between projects (followup PR)
  • This will likely involve significant build helper changes and this PR is already big enough.

[ni-jfitzger]

I have decided to revert changes related to independent versioning and restrict this to changes needed for the doc split.

[marcoskirsch]

Very little feedback on my part, I think it will be more efficient to push this in and then we can do a pass on how things look and what outdated stuff remains or what needs to be reworded.

This is great!