feat(kanidm): scale down to single replica, remove replication (#185)

Drop from 3 replicas to 1. Remove init container, repl-certs secret,
replication port, podAntiAffinity, server-1/2 configs, and replication
stanza from server-0.toml. Mount configmap directly via subPath.

Reviewed-on: #185

apps/base/kanidm/service.yaml

@@ -38,10 +38,6 @@ spec:
       port: 8443
       targetPort: https
       protocol: TCP
-    - name: replication
-      port: 8444
-      targetPort: replication
-      protocol: TCP
   selector:
     app.kubernetes.io/name: kanidm
     app.kubernetes.io/instance: kanidm