recommonmark deprecation

[miurahr]

The plugin supports recommonmark + sphinx_markdown_tables but now recommonmark went step down to unmaintained status.
recommonmark project recommend to use MyST parser altenatively.

It would be better to switch markdown parser .

[miurahr]

A workaround with #10 is working well.

Minimum required packages are:

• jinja2
• markdown_it
• mdit_py_plugins
• mdurl
• myst_parser

[miurahr]

I started fork of sphinx-binary that is shpinx-standalone project at https://codeberg.org/miurahr/sphinx-standalone/releases

you can get a binary that has Sphinx 5.3.0 with MyST-parser.