Automatic doc generation for the Matterwiki API

[krishnagopinath]

The API is slowly starting to grow to a "mid sized" application by itself and it might be time to start documenting it, so we can keep track of the changes to it.

The idea is simple:

• Someone adds an endpoint to an API and a JSDoc for the API (via PR)
• We could use apiDoc to convert JSDoc comments to html.
• We could stop here, but since we want this to be in our repo in MD, use apidoc-markdown to convert static html to MD.

We should probably automate these steps, maybe add a CI task that looks for changes in the src/api/* files and regenerates these whenever a PR is made.