What's the problem this feature will solve?

Custom prefixes for projects and subprojects were implemented in #10156, but we never documented them publicly. We have some internal docs about it in https://github.com/readthedocs/readthedocs.org/blob/main/readthedocs/proxito/README.rst#custom-path-prefixes.

We mention this feature in our pricing page (https://about.readthedocs.com/pricing/).

URL customization - Fine tune URLs used for your projects

We should link to our documentation from there with all the use cases this feature solves (proxying, removing or changing the "/projects" prefix).

There is also the discussion if we should expose this to users or manually handle this via support.

Front conversations