apply template (#9445)

content/en/docs/concepts/_index.md

@@ -1,11 +1,18 @@
 ---
 title: Concepts
 main_menu: true
+content_template: templates/concept
 weight: 40
 ---
 
+{{% capture overview %}}
+
 The Concepts section helps you learn about the parts of the Kubernetes system and the abstractions Kubernetes uses to represent your cluster, and helps you obtain a deeper understanding of how Kubernetes works.
 
+{{% /capture %}}
+
+{{% capture body %}}
+
 ## Overview
 
 To work with Kubernetes, you use *Kubernetes API objects* to describe your cluster's *desired state*: what applications or other workloads you want to run, what container images they use, the number of replicas, what network and disk resources you want to make available, and more. You set your desired state by creating objects using the Kubernetes API, typically via the command-line interface, `kubectl`. You can also use the Kubernetes API directly to interact with the cluster and set or modify your desired state.
@@ -57,9 +64,12 @@ The nodes in a cluster are the machines (VMs, physical servers, etc) that run yo
 
 * [Annotations](/docs/concepts/overview/working-with-objects/annotations/)
 
+{{% /capture %}}
 
-### What's next
+{{% capture whatsnext %}}
 
 If you would like to write a concept page, see
 [Using Page Templates](/docs/home/contribute/page-templates/)
 for information about the concept page type and the concept template.
+
+{{% /capture %}}