[TASK] Remove intersphinx dependency

Remove intersphinx from the docs build as it triggers network calls that
occasionally fail, and we don't really use intersphinx (links other
sphinx documents out on the internet)

This also removes the requirement for internet access during docs build.

This causes docs jobs to fail because we error out on warnings.

Implements: 6
Merge pull request #9 from shad7/task/6

[TASK] Remove intersphinx dependency