allow overwriting file extensions this plugin runs for

[vkarpov15]

Nice plugin! I got it mostly working for temporalio/documentation#496, the only issue is that we use .md instead of .mdx for our MDX files and there's no workaround for running this plugin on .md files.

[phryneas]

Hmm. The plugin generates mdx output - would this even work in a .md file? 🤔

I mean, if it does work for you I'm happy to merge, just wondering 😅

[vkarpov15]

Any md file is valid mdx, modulo edge cases :) I think the rationale is that our docs are written in plain markdown, hence .md, but docusaurus compiles the markdown files as mdx, so plugins can insert mdx functionality.

[slorber]

By default Docusaurus compile both .md/.mdx with MDX so that seems like a good option to allow this

Note in practice it's annoying for a few users because adopting Docusaurus means that commonmark docs are not always 100% compatible (facebook/docusaurus#3018)

[phryneas]

Then let's get this in :)

[phryneas]

This has been released in v1.0.9

[vkarpov15]

Thanks 👍 I'll take a look at integrating this into temporal's docs next week.