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/kustomization.yaml

@@ -25,5 +25,3 @@ configMapGenerator:
         app.kubernetes.io/instance: kanidm
     files:
       - server-0.toml=resources/server-0.toml
-      - server-1.toml=resources/server-1.toml
-      - server-2.toml=resources/server-2.toml