Docs: MyST markdown conversion and new theme
- Run
rst2myst convert doc/**/*.rst
Conversion failed for doc/versions/revision.rst and doc/api/data_types.rst - Add myst-parser to doc requirements
- Fix include md files
- Fix references
- Move to sphinx book theme (same as main Tango docs is moving to)
- Many minor doc fixes and improvements
Edited by Anton Joubert