Hugo config JSON schema

Hi, I was wondering if Hugo has a JSON schema definition for its configuration file?

A lot of other popular tools have this available and in addition post the schema on JSON Schema Store. Having this would allow for intelligent auto-completion in supported editors.

I tried making one once. Issue is that it seemed like something that could be generated automatically with the site.

I would be open to making a PR for this if there is some interest. @bep