[WIP] Create documentation for the API in a readthedocs format. It should use sphinx to document the API, using auto generated docs when available (and can add doc strings to existing api functions). Only the public API should be documented, ie, the apis i...

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original description:

Create documentation for the API in a readthedocs format. It should use sphinx to document the API, using auto generated docs when available (and can add doc strings to existing api functions). Only the public API should be documented, ie, the apis in scitokens.h.

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