Add some more docs to flora-6 README

Document how to deploy to flora-6

Document how to get SSH access

hosts/flora-6/README.md

@@ -1,3 +1,24 @@
+# Deploy infra branch to flora-6
+
+Use this command after updating flake inputs to update services on `flora-6`.
+
+```
+deploy --skip-checks --confirm-timeout 300 --targets '.#flora-6'
+
+An alternative, if deployment always fails and rolls back.
+
+```
+deploy --skip-checks --magic-rollback false --auto-rollback false --targets '.#flora-6'
+```
+
+# SSH access to flora-6
+Ensure your SSH public key is in place [here](./users/barkeeper/default.nix) and
+was deployed by someone with access.
+
+```
+ssh barkeeper@flora-6.pub.solar
+```
+
 # Mailman on NixOS docs
 
 - add reverse DNS record for IP