Make k8s.io/docs/home to support i18n (#12570)

* Make k8s.io/docs/home to support i18n

* Apply kbhawkey's review comment

content/en/docs/home/_index.md

@@ -16,4 +16,43 @@ menu:
     weight: 20
     post: >
       <p>Learn how to use Kubernetes with conceptual, tutorial, and reference documentation. You can even <a href="/editdocs/" data-auto-burger-exclude>help contribute to the docs</a>!</p>
+overview: >
+  Kubernetes is an open source container orchestration engine for automating deployment, scaling, and management of containerized applications. The open source project is hosted by the Cloud Native Computing Foundation (<a href="https://www.cncf.io/about">CNCF</a>).
+cards:
+- name: concepts
+  title: "Understand the basics"
+  description: "Learn about Kubernetes and its fundamental concepts."
+  button: "Learn Concepts"
+  button_path: "/docs/concepts"
+- name: tutorials
+  title: "Try Kubernetes"
+  description: "Follow tutorials to learn how to deploy applications in Kubernetes."
+  button: "View Tutorials"
+  button_path: "/docs/tutorials"
+- name: setup
+  title: "Set up a cluster"
+  description: "Get Kubernetes running based on your resources and needs."
+  button: "Set up Kubernetes"
+  button_path: "/docs/setup"
+- name: tasks
+  title: "Learn how to use Kubernetes"
+  description: "Look up common tasks and how to perform them using a short sequence of steps."
+  button: "View Tasks"
+  button_path: "/docs/tasks"
+- name: reference
+  title: Look up reference information
+  description: Browse terminology, command line syntax, API resource types, and setup tool documentation.
+  button: View Reference
+  button_path: /docs/reference
+- name: contribute
+  title: Contribute to the docs
+  description: Anyone can contribute, whether you’re new to the project or you’ve been around a long time.
+  button: Contribute to the docs
+  button_path: /docs/contribute
+- name: download
+  title: Download Kubernetes
+  description: If you are installing Kubernetes or upgrading to the newest version, refer to the current release notes.
+- name: about
+  title: About the documentation
+  description: This website contains documentation for the current and previous 4 versions of Kubernetes.
 ---