New Sphinx Setup for Director

[JasonGrace2282]

Note

The current state is very much incomplete - it's mostly here so if anyone wants to help out, they can,
and others can see the progress.

Improve the documentation of director, and convert to using Sphinx for documentation.
You can build it locally with

cd docs
pip install -r rtd-requirements.txt
make html  # or make.bat html for Windows

Ideally, this PR should have no production changes.

TODO

• Port old guides to sphinx
• Rewrite architecture guide
• Write detailed guide about each part of director
• Create/Upload Director logo

Follow-Ups

• Port Director documentation to Sphinx
• Get autodocumentation of manager, orchestrator, and other subprojects working.