Add hg.sr.ht migration plan

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+hg.sr.ht migration plan
+
+1. Build & install the new server (sakuya1) as VM host gen 2
+1. Announce planned outage a week in advance
+1. Spin up an hg.sr.ht stack and restore from the last backup. This is a
+   good opportunity to test our backups in action.
+1. Test everything!
+1. Set up pgbouncer on hg.sr.ht¹
+1. Await planned outage date
+1. Set hg.sr.ht¹ to read-only mode (via pgbouncer, probably, and disable
+   the hg SSH login account)
+1. rsync any changes which have occured between steps 3 and 6 to
+   hg.sr.ht²
+1. Cut DNS over to hg.sr.ht² and monitor as users get transferred over
+1. Disable cronjobs on hg.sr.ht¹
+1. Monitor hg.sr.ht¹ and shut it off when traffic is more or less done
+   hitting it
+1. Remove backup credentials for hg.sr.ht¹ from konapku.sr.ht
+1. Wait 2 weeks and then decommission hg.sr.ht¹
+
+Things to double check on hg.sr.ht²:
+
+- Is monitoring working? Double check node exporter
+- Are backups working?
+- Are ZFS snapshots being taken correctly?
+- Are ZFS scrubs being run? Double check on the 1st