Update overview toc in chinese. (#15737)

content/zh/docs/concepts/overview/_index.md

@@ -0,0 +1,4 @@
+---
+title: "概述"
+weight: 20
+---

content/zh/docs/concepts/overview/components.md

@@ -6,6 +6,7 @@ redirect_from:
 - "/docs/admin/cluster-components/"
 - "/docs/admin/cluster-components.html"
 content_template: templates/concept
+weight: 20
 ---
 {{% capture overview %}}
 本文档概述了 Kubernetes 所需的各种二进制组件, 用于提供齐全的功能。

content/zh/docs/concepts/overview/kubernetes-api.md

@@ -1,3 +1,8 @@
+---
+title: Kubernetes API
+weight: 30
+---
+
 # Kubernetes API 概述
 
 [API协议文档](https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md)描述了主系统和API概念。

content/zh/docs/concepts/overview/what-is-kubernetes.md

@@ -3,6 +3,7 @@ approvers:
 - k8s-merge-robot
 
 title: 认识 Kubernetes?
+weight: 10
 ---
 
 Kubernetes 是一个跨主机集群的 [开源的容器调度平台，它可以自动化应用容器的部署、扩展和操作](http://www.slideshare.net/BrianGrant11/wso2con-us-2015-kubernetes-a-platform-for-automating-deployment-scaling-and-operations) , 提供以容器为中心的基础架构。

content/zh/docs/concepts/overview/working-with-objects/_index.md

@@ -0,0 +1,4 @@
+---
+title: "使用 Kubernetes 对象"
+weight: 40
+---

content/zh/docs/concepts/overview/working-with-objects/kubernetes-objects.md

@@ -5,6 +5,7 @@ redirect_from:
 - "/docs/concepts/abstractions/overview/"
 - "/docs/concepts/abstractions/overview.html"
 content_template: templates/concept
+weight: 10
 ---
 
 {{% capture overview %}}