Fixup reference folder lost _index file problem. (#16407)

But some files are so old that need be deleted.
Be confirming with chinese work team.

content/zh/docs/reference/_index.md

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+---
+title: 参考
+approvers:
+- chenopis
+linkTitle: "参考"
+main_menu: true
+weight: 70
+content_template: templates/concept
+---
+
+<!--
+---
+title: Reference
+approvers:
+- chenopis
+linkTitle: "Reference"
+main_menu: true
+weight: 70
+content_template: templates/concept
+---
+-->
+
+{{% capture overview %}}
+
+<!--
+This section of the Kubernetes documentation contains references.
+-->
+这是 Kubernetes 文档的参考部分。
+
+{{% /capture %}}
+
+{{% capture body %}}
+
+## API 参考
+
+* [Kubernetes API 概述](/docs/reference/using-api/api-overview/) - Kubernetes API 概述。
+* Kubernetes API 版本
+  * [1.15](/docs/reference/generated/kubernetes-api/v1.15/)
+  * [1.14](/docs/reference/generated/kubernetes-api/v1.14/)
+  * [1.13](/docs/reference/generated/kubernetes-api/v1.13/)
+  * [1.12](/docs/reference/generated/kubernetes-api/v1.12/)
+  * [1.11](/docs/reference/generated/kubernetes-api/v1.11/)
+
+<!--
+## API Reference
+
+* [Kubernetes API Overview](/docs/reference/using-api/api-overview/) - Overview of the API for Kubernetes.
+* Kubernetes API Versions
+  * [1.15](/docs/reference/generated/kubernetes-api/v1.15/)
+  * [1.14](/docs/reference/generated/kubernetes-api/v1.14/)
+  * [1.13](/docs/reference/generated/kubernetes-api/v1.13/)
+  * [1.12](/docs/reference/generated/kubernetes-api/v1.12/)
+  * [1.11](/docs/reference/generated/kubernetes-api/v1.11/)
+-->
+
+## API 客户端库
+
+如果您需要通过编程语言调用 Kubernetes API，您可以使用
+[客户端库](/docs/reference/using-api/client-libraries/)。以下是官方支持的
+客户端库：
+
+- [Kubernetes Go 语言客户端库](https://github.com/kubernetes/client-go/)
+- [Kubernetes Python 语言客户端库](https://github.com/kubernetes-client/python)
+- [Kubernetes Java 语言客户端库](https://github.com/kubernetes-client/java)
+- [Kubernetes JavaScript 语言客户端库](https://github.com/kubernetes-client/javascript)
+
+<!--
+## API Client Libraries
+
+To call the Kubernetes API from a programming language, you can use
+[client libraries](/docs/reference/using-api/client-libraries/). Officially supported
+client libraries:
+
+- [Kubernetes Go client library](https://github.com/kubernetes/client-go/)
+- [Kubernetes Python client library](https://github.com/kubernetes-client/python)
+- [Kubernetes Java client library](https://github.com/kubernetes-client/java)
+- [Kubernetes JavaScript client library](https://github.com/kubernetes-client/javascript)
+-->
+
+## CLI 参考
+
+* [kubectl](/docs/user-guide/kubectl-overview) - 主要的 CLI 工具，用于运行命令和管理 Kubernetes 集群。
+    * [JSONPath](/docs/user-guide/jsonpath/) - 通过 kubectl 使用 [JSONPath 表达式](http://goessner.net/articles/JsonPath/) 的语法指南。
+* [kubeadm](/docs/admin/kubeadm/) - 此 CLI 工具可轻松配置安全的 Kubernetes 集群。
+* [kubefed](/docs/admin/kubefed/) - 此 CLI 工具可帮助您管理集群联邦。
+
+<!--
+## CLI Reference
+
+* [kubectl](/docs/user-guide/kubectl-overview) - Main CLI tool for running commands and managing Kubernetes clusters.
+    * [JSONPath](/docs/user-guide/jsonpath/) - Syntax guide for using [JSONPath expressions](http://goessner.net/articles/JsonPath/) with kubectl.
+* [kubeadm](/docs/admin/kubeadm/) - CLI tool to easily provision a secure Kubernetes cluster.
+* [kubefed](/docs/admin/kubefed/) - CLI tool to help you administrate your federated clusters.
+-->
+
+## 配置参考
+
+* [kubelet](/docs/admin/kubelet/) - 在每个节点上运行的主 *节点代理* 。kubelet 采用一组 PodSpecs 并确保所描述的容器健康地运行。
+* [kube-apiserver](/docs/admin/kube-apiserver/) - REST API，用于验证和配置 API 对象（如 pod，服务，副本控制器）的数据。
+* [kube-controller-manager](/docs/admin/kube-controller-manager/) - 一个守护进程，它嵌入到了 Kubernetes 的附带的核心控制循环。
+* [kube-proxy](/docs/admin/kube-proxy/) - 可以跨一组后端进行简单的 TCP/UDP 流转发或循环 TCP/UDP 转发。
+* [kube-scheduler](/docs/admin/kube-scheduler/) - 一个调度程序，用于管理可用性、性能和容量。
+* [federation-apiserver](/docs/admin/federation-apiserver/) - 联邦集群的 API 服务器。
+* [federation-controller-manager](/docs/admin/federation-controller-manager/) - 一个守护进程，它嵌入到了 Kubernetes 联邦的附带的核心控制循环。
+
+<!--
+## Config Reference
+
+* [kubelet](/docs/admin/kubelet/) - The primary *node agent* that runs on each node. The kubelet takes a set of PodSpecs and ensures that the described containers are running and healthy.
+* [kube-apiserver](/docs/admin/kube-apiserver/) - REST API that validates and configures data for API objects such as  pods, services, replication controllers.
+* [kube-controller-manager](/docs/admin/kube-controller-manager/) - Daemon that embeds the core control loops shipped with Kubernetes.
+* [kube-proxy](/docs/admin/kube-proxy/) - Can do simple TCP/UDP stream forwarding or round-robin TCP/UDP forwarding across a set of back-ends.
+* [kube-scheduler](/docs/admin/kube-scheduler/) - Scheduler that manages availability, performance, and capacity.
+* [federation-apiserver](/docs/admin/federation-apiserver/) - API server for federated clusters.
+* [federation-controller-manager](/docs/admin/federation-controller-manager/) - Daemon that embeds the core control loops shipped with Kubernetes federation.
+-->
+
+## 设计文档
+
+Kubernetes 功能的设计文档归档，不妨考虑从 [Kubernetes 架构](https://git.k8s.io/community/contributors/design-proposals/architecture/architecture.md) 和 [Kubernetes 设计概述](https://git.k8s.io/community/contributors/design-proposals)开始阅读。
+
+<!--
+## Design Docs
+
+An archive of the design docs for Kubernetes functionality. Good starting points are [Kubernetes Architecture](https://git.k8s.io/community/contributors/design-proposals/architecture/architecture.md) and [Kubernetes Design Overview](https://git.k8s.io/community/contributors/design-proposals).
+
+-->
+{{% /capture %}}

content/zh/docs/reference/access-authn-authz/_index.md

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+---
+title: 访问 API
+weight: 20
+toc-hide: true
+---

content/zh/docs/reference/command-line-tools-reference/_index.md

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+---
+title: 命令行工具
+weight: 60
+toc-hide: true
+---

content/zh/docs/reference/issues-security/_index.md

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+---
+title: Kubernetes 问题和安全
+weight: 10
+toc-hide: true
+---

content/zh/docs/reference/kubectl/_index.md

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+---
+title: "kubectl CLI"
+weight: 60
+---
+

content/zh/docs/reference/kubernetes-api/_index.md

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+---
+title: Kubernetes API 
+weight: 30
+---

content/zh/docs/reference/kubernetes-api/index.md

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+---
+title: v1.15
+---
+
+[Kubernetes API v1.15](/docs/reference/generated/kubernetes-api/v1.15/)

content/zh/docs/reference/setup-tools/_index.md

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+---
+title: 安装工具
+weight: 50
+toc-hide: true
+---

content/zh/docs/reference/setup-tools/kubeadm/_index.md

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+---
+title: "Kubeadm"
+weight: 10
+toc-hide: true
+---

content/zh/docs/reference/setup-tools/kubeadm/generated/_index.md

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+---
+title: "创建 Kubeadm"
+weight: 10
+toc_hide: true
+---
+