Use JSON format instead of YAML for configuration files

Currently, we are using YAML for our configuration files, but I suggest that we switch to using JSON format instead.

There are several benefits to making this change. First and foremost, using JSON instead of YAML removes our dependency on the js-yaml library. This means that we can reduce the number of dependencies we have, which can help to simplify our codebase and make it easier to maintain.

In addition, using JSON for all of our input, output, and configuration files will help to simplify things even further.