refactor: rename postgres to postgresql

- ArgoCD application name
- argocd app source path

_apps/kissj-postgresql.yml

@@ -1,7 +1,7 @@
 apiVersion: argoproj.io/v1alpha1
 kind: Application
 metadata:
-  name: kissj-postgres
+  name: kissj-postgresql
   namespace: argocd
 spec:
   destination:
@@ -9,7 +9,7 @@ spec:
     server: https://kubernetes.default.svc
   project: kissj
   source:
-    path: postgres
+    path: postgresql
     repoURL: https://gitlab.mareshq.com/gitops/skautdevs/kissj.git
     targetRevision: HEAD
   syncPolicy: