Before merging: maybe also add a warning to the top of the guide informing users, that the feature/provider is not yet available on Hanko Cloud? Once it is available we remove the warning (we did so with the Microsoft provider/guide, see here for example).

That way we can also already reference it in the backend README. We did not want to duplicate content in the README, so there are links to the guides in the docs even though they are Cloud only. But this way self-hosters can also learn how to obtain credentials from third party providers by looking at the relevant sections.