Documentation subsets/project profiles

I'm working on several different projects, and each uses a different set of DevDocs-supported technologies. I'd like to be able to enable and disable different subsets of documentation at will, with each subset corresponding to a project I'm developing. Does that make sense?

No files, tests, or entry points are named in the issue. First clarify how project profiles should be created, selected, and persisted; done would mean users can enable and disable distinct subsets of DevDocs-supported documentation for each project.

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