Replace Sphinx Redoc with Swagger API Docs

[jscheffl]

As we have the Sphinx-Redoc issue with setuptools still not fixed and it seems the plugin is not maintained (see sphinx-contrib/redoc#54) this PR attempts to replace it with swagger. As this is better maintained.

DRAFT because:

• Dark mode needs custom CSS, stay tuned
• Need to check if CI really is good
• Wait a moment for a feedback regarding the feature request in Add ability to mirror swagger dependencies to sphinx doctree SAP/swagger-plugin-for-sphinx#508

What is does:

• Remove redoc, allows to bump setuptools again!
• Add swagger redenring from another lib (see https://pypi.org/project/swagger-plugin-for-sphinx/)
• Adjust to mirror swagger code into the doctree for privacy
• Adjust core, simple-auth-manager, fab and keycloak to new doc rendering
• Add Edge REST API generation

New look:

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