Move API overview to be a Docsy section overview

content/en/docs/concepts/overview/kubernetes-api.md

@@ -103,8 +103,8 @@ and behavior, and to enable controlling access to end-of-life and/or
 experimental APIs.
 
 To make it easier to evolve and to extend its API, Kubernetes implements
-[API groups](/docs/reference/using-api/api-overview/#api-groups) that can be
-[enabled or disabled](/docs/reference/using-api/api-overview/#enabling-or-disabling).
+[API groups](/docs/reference/using-api/#api-groups) that can be
+[enabled or disabled](/docs/reference/using-api/#enabling-or-disabling).
 
 API resources are distinguished by their API group, resource type, namespace
 (for namespaced resources), and name. The API server may serve the same
@@ -115,7 +115,7 @@ versions `v1` and `v1beta1` for the same resource. An object created by the
 `v1beta1` version can then be read, updated, and deleted by either the
 `v1beta1` or the `v1` versions.
 
-Refer to [API versions reference](/docs/reference/using-api/api-overview/#api-versioning)
+Refer to [API versions reference](/docs/reference/using-api/#api-versioning)
 for more details on the API version level definitions.
 
 ## API Extension

content/en/docs/concepts/overview/working-with-objects/kubernetes-objects.md

@@ -91,9 +91,9 @@ and the `spec` format for a Deployment can be found in
 
 ## {{% heading "whatsnext" %}}
 
-* [Kubernetes API overview](/docs/reference/using-api/api-overview/) explains some more API concepts
 * Learn about the most important basic Kubernetes objects, such as [Pod](/docs/concepts/workloads/pods/).
-* Learn about [controllers](/docs/concepts/architecture/controller/) in Kubernetes
+* Learn about [controllers](/docs/concepts/architecture/controller/) in Kubernetes.
+* [Using the Kubernetes API](/docs/reference/using-api/) explains some more API concepts.