Move REST API docs support to sphinx-scylladb-theme #722
Description
Motivation
We generate API documentation for https://github.com/scylladb/scylla-cloud-doc using Redocly and a set of custom scripts. However, it would be useful for other projects to generate their own REST API documentation. To achieve this, we could consider moving the documentation generation logic to this project.
Considerations
As part of this effort, we might need to add npm support to the toolchain. See https://github.com/scylladb/scylla-cloud-doc/pull/113#issuecomment-1467700163