update nav (vesoft-inc#2193)

* update nav

* Update mkdocs.yml

---------

Co-authored-by: abby.huang <78209557+abby-cyber@users.noreply.github.com>

mkdocs.yml

@@ -136,9 +136,9 @@ extra_javascript:
 extra:
   # Language selector.
   alternate:
-   - name: 中文
-     link: https://docs.nebula-graph.com.cn/
-     lang: zh
+    - name: 中文
+      link: https://docs.nebula-graph.com.cn/
+      lang: zh
 
   analytics:
     provider: google
@@ -707,29 +707,29 @@ nav:
       - Export data from NebulaGraph: nebula-exchange/use-exchange/ex-ug-export-from-nebula.md
     - Exchange FAQ: nebula-exchange/ex-ug-FAQ.md
 
-   - Operator:
-       - What is NebulaGraph Operator: nebula-operator/1.introduction-to-nebula-operator.md
-       - Overview of using NebulaGraph Operator: nebula-operator/6.get-started-with-operator.md
-       - Deploy NebulaGraph Operator: nebula-operator/2.deploy-nebula-operator.md
-       - Deploy clusters: 
+  - Operator:
+    - What is NebulaGraph Operator: nebula-operator/1.introduction-to-nebula-operator.md
+    - Overview of using NebulaGraph Operator: nebula-operator/6.get-started-with-operator.md
+    - Deploy NebulaGraph Operator: nebula-operator/2.deploy-nebula-operator.md
+    - Deploy clusters: 
  #ent    
-         - Deploy LM: nebula-operator/3.deploy-nebula-graph-cluster/3.0.deploy-lm.md     
-         - Deploy clusters with Kubectl: nebula-operator/3.deploy-nebula-graph-cluster/3.1create-cluster-with-kubectl.md
-         - Deploy clusters with Helm: nebula-operator/3.deploy-nebula-graph-cluster/3.2create-cluster-with-helm.md
-       - Connect to NebulaGraph databases: nebula-operator/4.connect-to-nebula-graph-service.md
-      - Configure clusters:
+      - Deploy LM: nebula-operator/3.deploy-nebula-graph-cluster/3.0.deploy-lm.md     
+      - Deploy clusters with Kubectl: nebula-operator/3.deploy-nebula-graph-cluster/3.1create-cluster-with-kubectl.md
+      - Deploy clusters with Helm: nebula-operator/3.deploy-nebula-graph-cluster/3.2create-cluster-with-helm.md
+    - Connect to NebulaGraph databases: nebula-operator/4.connect-to-nebula-graph-service.md
+    - Configure clusters:
         - Custom configuration parameters for a NebulaGraph cluster: nebula-operator/8.custom-cluster-configurations/8.1.custom-conf-parameter.md
         - Reclaim PVs: nebula-operator/8.custom-cluster-configurations/8.2.pv-reclaim.md 
 #ent
         - Balance storage data after scaling out: nebula-operator/8.custom-cluster-configurations/8.3.balance-data-when-scaling-storage.md
         - Manage cluster logs: nebula-operator/8.custom-cluster-configurations/8.4.manage-running-logs.md
         - Enable SSL encryption: nebula-operator/8.custom-cluster-configurations/8.5.enable-ssl.md
-      - Upgrade NebulaGraph clusters: nebula-operator/9.upgrade-nebula-cluster.md
-      - Specify a rolling update strategy: nebula-operator/11.rolling-update-strategy.md
+        - Specify a rolling update strategy: nebula-operator/11.rolling-update-strategy.md
+    - Upgrade NebulaGraph clusters: nebula-operator/9.upgrade-nebula-cluster.md
 #ent
-      - Backup and restore: nebula-operator/10.backup-restore-using-operator.md
-      - Self-healing: nebula-operator/5.operator-failover.md
-      - FAQ: nebula-operator/7.operator-faq.md
+    - Backup and restore: nebula-operator/10.backup-restore-using-operator.md
+    - Self-healing: nebula-operator/5.operator-failover.md
+    - FAQ: nebula-operator/7.operator-faq.md
 
   - Graph computing: