Publish JSON schemas separately in documentation

[alexgarel]

What

• We use redoc to render the API documentation. This is cool, but it is a bit hard to see the structure of the data there, and not easy to split in chunks.
• We split some of the the JSON schemas in chunks in YAML files, we could leverage it and use a tool to publish only JSON schemas in reference (it would be something complementary to OpenAPI rendering).
• See https://json-schema.org/implementations.html#documentation-generators for available tools.

Part of

• 📝 API Documentation using OpenAPI (tracker) #7446

[github-actions]

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