update image and feature page

Signed-off-by: lannyfu <lannyfu@kubesphere.io>

content/en/features/_index.md

@@ -41,6 +41,7 @@ section2:
     - icon: /images/features/gatekeeper.svg
       name: GateKeeper
       content: Admission controller with flexible security policy configuration
+      label: extension
     - icon: /images/features/metrics-server.svg
       name: Metrics Server
       content: Scalable and efficient container resource metrics source, serving Kubernetes' built-in auto-scaling pipeline
@@ -67,7 +68,7 @@ section2:
       label: Extension
     - icon: /images/features/ob-operator.svg
       name: OB-Operator
-      content: Manage OceanBase-related resources in Kubernetes clusters 
+      content: Manage OceanBase-related resources in Kubernetes clusters
       label: Extension
     - icon: /images/features/ob-operator.svg
       name: OceanBase Dashboard

content/zh/features/_index.md

@@ -41,6 +41,7 @@ section2:
     - icon: /images/features/gatekeeper.svg
       name: GateKeeper
       content: 可灵活配置安全策略的准入控制器
+      label: extension
     - icon: /images/features/metrics-server.svg
       name: Metrics Server
       content: 可扩展、高效的容器资源度量源，为 Kubernetes 内置的自动扩展管道提供服务