Docs: Document how to interact with Aragon Court through the CLI tool

[facuspagnuolo]

After a conversation with @john-light and based on a few past experiences, it seems like it would be helpful to provide a way to interact with Aragon Court apart from the Court Dashboard. This could solve problems like having issues with the site or the Graph, etc, or maybe simply a dev-oriented way to use it. We could leverage the Court CLI tool we built for development and adjust it a little bit to write a proper guide of how jurors can use it.