This is pretty awesome. Now I’m just a dumbo sysadmin with limited webdev/JS skills, so is there a high level way to integrate this into a site so that it could create MD files that could be saved server side?

Most JS/TS runtimes have filesystem modules, at it's simplest/least secure you could implement it with client-side fetch and:

On get request - find matching .MD file and return

On put request - write to given location