[DO-1600] Move mermaid to new ns (!34)

[DO-1600]

Co-authored-by: denis.patrakeev <denis.patrakeev@avroid.tech>
Reviewed-on: https://git.avroid.tech/K8s/k8s-configs/pulls/34

clusters/k8s-avroid-office.prod.local/namespaces/prod/mermaid/kustomize/mermaid-ingress.yaml

@@ -0,0 +1,21 @@
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: mermaid
+  labels:
+    app.kubernetes.io/name: mermaid
+    app.kubernetes.io/instance: mermaid
+spec:
+  ingressClassName: nginx
+  rules:
+    - host: mermaid.avroid.tech
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: mermaid
+                port:
+                  name: http