JSON:API spec experiment

[Sporiff]

🚨 EXPERIMENT ONLY 🚨

This PR is just a brain dump of some things I've been thinking about regarding a structured and linked approach to designing the API. Nothing in this PR is agreed-upon with the team. This PR exists only to generate a preview link.

Overview

This PR is the culmination of many different thoughts I've had about the Open Podcast API, its future, and how we can try to unstick the project. It takes the existing ideas already present and rearranges them in the following ways:

1. Using JSON:API as a standard format for linked endpoint data.
2. Using the new UUIDv5 logic proposed in Add UUID namespace details #140.

Starlight changes

This PR also brings some changes to clean up the appearance of Starlight. This is just an experiment to see how well this would work for our use case. These changes can easily be ported.

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[Sporiff]

Not going to use this, but will probably take some of the ideas for rearranging the docs.