Feature request: allow YAML for all files or implement a loader hook

For some parts you use already js-yaml, why not add an option to parse yaml files instead json?
The yaml files could then internally be transformed to json and parsed like json.

I think a fork to implement this feature is too much.
A loader hook would be a good thing too.

Currently i use a script to read all yaml files, transform them to json, write them to a temp dir where jsonschema2md can use it.

Start by reviewing the existing js-yaml usage and the input-loading path for files consumed by jsonschema2md. Clarify whether the intended outcome is YAML support for all files or an extensible loader hook; done should be defined as one of those approaches working without the temporary JSON conversion script.

Written by the indexing model from the issue text.