Add description (#19538)

Author: Tim Bannister

content/en/docs/home/_index.md

@@ -16,6 +16,8 @@ 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>
+description: >
+  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.
 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: