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

pgweb/manifests/secret.yaml

@@ -0,0 +1,26 @@
+apiVersion: external-secrets.io/v1
+kind: ExternalSecret
+metadata:
+  name: pgweb-secret
+  namespace: pgweb
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    kind: ClusterSecretStore
+    name: vault-backend
+  target:
+    name: pgweb-password
+    creationPolicy: Owner
+  data:
+    - secretKey: database-url
+      remoteRef:
+        key: databases/pgweb
+        property: DATABASE_URL
+    - secretKey: auth-user
+      remoteRef:
+        key: databases/pgweb
+        property: AUTH_USER
+    - secretKey: auth-password
+      remoteRef:
+        key: databases/pgweb
+        property: AUTH_PASSWORD