Issue Description:

Hosting a single documentation archive is relatively straightforward and well-documented

However, when attempting to host multiple versions of documentation for the same module name it seems that the default routing doesn't work as this relies on the resources being at certain paths relative to the root of the server.

I could imagine a general "prefix" mechanism allowing a prefix to all of these paths being specified could help enable this use case and others where several documentation archives are hosted on one host without needing to adjust URL rewriting rules.