Is your feature request related to a problem? Please describe.

Use case: Render a snippet of markdown in a file on disk into HTML.

Describe the solution you'd like

A commandline interface to parse markdown and render HTML (and optionally configure markdown-it-py first)

Describe alternatives you've considered

I could write a script with an argparse.ArgumentParser and use that; but that might as well just be a console_scripts entry_point in markdown-it-py; in which case an actual argparse.ArgumentParser is justifiied.

Additional context

None