Feature: embedded project documentation site

[clrcrl]

Can we render a project's documentation website on the Hub?

Potentially just for the integration tests (which makes it even more important to have integration tests)

Esp. with macros now able to be documented.

I think the answer to this is going to rely on changes to how we release projects. We'll need some step that runs dbt docs generate and attaches the artifacts to the release (as binaries???), which Hub can then consume.