[SE-2958, SE-248] Move Keith to Bebop
... and hand backup for sprint management roles over to Gábor.
Other drive-by adjustments:
- Change Chris's status from contractor to core (FAL-49).
- Fix some typos and broken links.
Tickets
Rendered changes
https://opencraft.gitlab.io/-/documentation/public/-/jobs/3761314964/artifacts/preview/index.html
Edited by Tim Krones