Update _index.md

"Understand the basics" to "Understand Kubernetes". There is no place in the entire docs really to go "Understand the *non* basics". There is one section "Concepts" for better or worse. Don't give the impression there is something else somewhere else. And anyway, this section should aspire to be that cardinal. Also change name of weird button to "Learn" -> "View" to make it clear this is just a link to a section of the documentation.

Author: sgpinkus

content/en/docs/home/_index.md

@@ -22,9 +22,9 @@ 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"
+  title: "Understand Kubernetes"
   description: "Learn about Kubernetes and its fundamental concepts."
-  button: "Learn Concepts"
+  button: "View Concepts"
   button_path: "/docs/concepts"
 - name: tutorials
   title: "Try Kubernetes"