Geo: Simplify the demotion process
## Summary Demoting is essentially re-adding everything. We need better docs and should avoid rsyncing as much as possible. This is important for full failback. ## Ideas * Single-command to demote a primary to a secondary. * Support/require Patroni for single-node Geo deployments to avoid the need to completely resync the database and allow easier scale-out. * Create runbook style documentation for single and multi-node Geo deployments. * ...
epic