Mardown-it implementation of `inputpath-to-url`

[nhoizey]

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

No response

Describe the solution you'd like

https://www.11ty.dev/docs/plugins/inputpath-to-url/ is a great addition to Eleventy features.

As most of such links would probably be inside Markdown content, would it make sense to also provide a Markdown-it version, that would probably be much faster?

Describe alternatives you've considered

No response

Additional context

No response