We used recommonmark so that we can use markdown in sphinx but it is
buggy and now so switch to better supported MyST-parser.
* Fixed incorrect heading warnings in markdown.
* Added sphinx toctree to markdown using directive as required by MyST.
* Upgraded Sphinx to 4.3
Ref: https://myst-parser.readthedocs.io
- Tweaked the layout a bit with optional part of dependency description.
- Updated descriptions to help understand dependency usage.
- Made intltool and chardet packages optional. This will help with
installation where these might be missing and are not crucial.
- Remove gettext from dependency as is part of Python.
Use markdown to aid readability.
Update the README and use it for the long_description in setup.py
Add detailed requirement information to the DEPENDS files.