docs: 서브도메인 연결 내용 README 추가

10-ingress-argocd.yaml

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+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: argocd-ingress
+  namespace: argocd
+  annotations:
+    cert-manager.io/cluster-issuer: letsencrypt-prod
+    nginx.ingress.kubernetes.io/ssl-redirect: "true"
+    nginx.ingress.kubernetes.io/backend-protocol: "HTTPS"
+    nginx.ingress.kubernetes.io/proxy-read-timeout: "60"
+    nginx.ingress.kubernetes.io/proxy-connect-timeout: "10"
+spec:
+  ingressClassName: nginx
+  tls:
+  - hosts:
+    - argo.cyanburu.com
+    secretName: argocd-tls
+  rules:
+  - host: argo.cyanburu.com
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: argocd-server
+            port:
+              number: 443