[SR-15541] Support hosting of multiple DocC archive(s) (versions)

[swift-ci]

Previous ID	SR-15541
Radar	None
Original Reporter	sean.labastille (JIRA User)
Type	New Feature

Additional Detail from JIRA

Votes	0
Component/s	Swift-DocC
Labels	New Feature
Assignee	None
Priority	Medium

md5: d8b94f21136b90a125e8e8af7be04f87

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.