Add a sphinx command to help with migrating to sphinx 3

changed milestone to %Bob 9.0.0

mentioned in merge request beat/beat.core!128 (merged)

added 1 commit

• 398df15d - [sphinx cli] Add more autodoc flags variants

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added 1 commit

• 7cc8257d - [sphinx docs] update for sphinx 3

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unmarked as a Work In Progress

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• 20946d50 - Add minimal tests for sphinx commands

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enabled an automatic merge when the pipeline for 20946d50 succeeds

merged

mentioned in commit a1305e06