Add a CLI mode to the parser (`cli.mjs`)

[ovflowd]

After completing #1, we aim to add a "JavaScript binary" that you can quickly call, following NPM's package.json documentation for bin.

This aims to provide functionality to:

• Provide a glob for input (-i)
  • This can be a single API doc file, or a glob to all markdown files of a folder or subfolder (like doc/api/*.md
• Provide an output folder path -o
  • This is not a glob but simple a directory to output generated contents
  • File names will match input file names
• Provide an execution target mode (-t)
  • Initially it will only support mdx this can be a comma-separated value of one or more output formats we'll support in the future (like json, html, mdx)

This file should be stored within a bin/cli.mjs file

[ovflowd]

cc @canerakdas I remember you were looking for options here?

[canerakdas]

cc @canerakdas I remember you were looking for options here?

Yes, I'm working on it 🚀