Using interrogate as Sphinx extension

I have made a prototype to integrate [documentation coverage](https://pytooling.github.io/sphinx-reports/DocCov/index.html) results directly into a Sphinx documentation.

Are you interested in a cooperation?
Could you support this?

Source: https://pytooling.github.io/sphinx-reports/DocCoverage.html

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Similar reports I can generate are:
* unit testing results: https://pytooling.github.io/sphinx-reports/unittests/index.html
* code coverage summary: https://pytooling.github.io/sphinx-reports/coverage/index.html