[zh-cn] Move what-is-kubernetes to overview page

Author: windsonsea

content/zh-cn/_index.html

@@ -8,8 +8,8 @@
 {{< blocks/section id="oceanNodes" >}}
 {{% blocks/feature image="flower" %}}
 
-<!-- ### [Kubernetes]({{< relref "/docs/concepts/overview/what-is-kubernetes" >}}) is an open-source system for automating deployment, scaling, and management of containerized applications. -->
-### [Kubernetes]({{< relref "/docs/concepts/overview/what-is-kubernetes" >}}) 是用于自动部署，扩展和管理容器化应用程序的开源系统。
+<!-- [Kubernetes]({{< relref "/docs/concepts/overview/" >}}), also known as K8s, is an open-source system for automating deployment, scaling, and management of containerized applications. -->
+[Kubernetes]({{< relref "/docs/concepts/overview/" >}}) 也称为 K8s，是用于自动部署、扩缩和管理容器化应用程序的开源系统。
 
 <!-- It groups containers that make up an application into logical units for easy management and discovery.
 Kubernetes builds upon [15 years of experience of running production workloads at Google](http://queue.acm.org/detail.cfm?id=2898444),
@@ -24,8 +24,7 @@
 <!-- #### Planet Scale -->
 #### 星际尺度
 
-<!-- Designed on the same principles that allows Google to run billions of containers a week,
-Kubernetes can scale without increasing your ops team. -->
+<!-- Designed on the same principles that allow Google to run billions of containers a week, Kubernetes can scale without increasing your operations team. -->
 
 Google 每周运行数十亿个容器，Kubernetes 基于与之相同的原则来设计，能够在不扩张运维团队的情况下进行规模扩展。