Solidify plan for Stephen ownership handoff

Created by: slimsag

General tracking issue for executing this plan: https://docs.google.com/document/d/1LDQQx7xMQ5GKB9b2nwTPlWqN7s4FPbNFEoINvNtJeNU/edit?usp=sharing

Context: https://github.com/sourcegraph/about/pull/1754