REFACTOR(repo): move vault/ to manifests/

- Move ExternalSecret files from vault/ to manifests/secret.yaml
- Merge multiple secrets with --- separator (postgresql)
- Update kustomization.yaml references
- Remove vault/ folders

Apps: postgresql, postgresql-dev, pgweb, minio, velero

postgresql-dev/manifests/secret.yaml

@@ -0,0 +1,22 @@
+apiVersion: external-secrets.io/v1
+kind: ExternalSecret
+metadata:
+  name: postgresql-password-dev
+  namespace: postgresql-dev
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    kind: ClusterSecretStore
+    name: vault-backend
+  target:
+    name: postgresql-password-dev
+    creationPolicy: Owner
+  data:
+    - secretKey: password
+      remoteRef:
+        key: databases/postgresql-dev
+        property: PASSWORD
+    - secretKey: postgres-password
+      remoteRef:
+        key: databases/postgresql-dev
+        property: POSTGRES_PASSWORD