Convert site to Hugo (#8316)

This commit converts content and layout to use Hugo.
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+---
+title: Change the default StorageClass
+content_template: templates/task
+---
+
+{{% capture overview %}}
+This page shows how to change the default Storage Class that is used to
+provision volumes for PersistentVolumeClaims that have no special requirements.
+
+{{% /capture %}}
+
+{{% capture prerequisites %}}
+
+{{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
+
+{{% /capture %}}
+
+{{% capture steps %}}
+
+## Why change the default storage class?
+
+Depending on the installation method, your Kubernetes cluster may be deployed with
+an existing StorageClass that is marked as default. This default StorageClass
+is then used to dynamically provision storage for PersistentVolumeClaims
+that do not require any specific storage class. See
+[PersistentVolumeClaim documentation](/docs/concepts/storage/persistent-volumes/#class-1)
+for details.
+
+The pre-installed default StorageClass may not fit well with your expected workload;
+for example, it might provision storage that is too expensive. If this is the case,
+you can either change the default StorageClass or disable it completely to avoid
+dynamic provisioning of storage.
+
+Simply deleting the default StorageClass may not work, as it may be re-created
+automatically by the addon manager running in your cluster. Please consult the docs for your installation
+for details about addon manager and how to disable individual addons.
+
+## Changing the default StorageClass
+
+1. List the StorageClasses in your cluster:
+
+       kubectl get storageclass
+
+    The output is similar to this:
+
+        NAME                 TYPE
+        standard (default)   kubernetes.io/gce-pd
+        gold                 kubernetes.io/gce-pd
+
+   The default StorageClass is marked by `(default)`.
+
+1. Mark the default StorageClass as non-default:
+
+   The default StorageClass has an annotation
+   `storageclass.kubernetes.io/is-default-class` set to `true`. Any other value
+   or absence of the annotation is interpreted as `false`.
+
+   To mark a StorageClass as non-default, you need to change its value to `false`:
+
+       kubectl patch storageclass <your-class-name> -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"false"}}}'
+
+    where `<your-class-name>` is the name of your chosen StorageClass.
+
+1. Mark a StorageClass as default:
+
+   Similarly to the previous step, you need to add/set the annotation
+   `storageclass.kubernetes.io/is-default-class=true`.
+
+       kubectl patch storageclass <your-class-name> -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
+
+   Please note that at most one StorageClass can be marked as default. If two
+   or more of them are marked as default, Kubernetes ignores the annotation,
+   i.e. it behaves as if there is no default StorageClass.
+
+1. Verify that your chosen StorageClass is default:
+
+       kubectl get storageclass
+
+    The output is similar to this:
+
+        NAME             TYPE
+        standard         kubernetes.io/gce-pd
+        gold (default)   kubernetes.io/gce-pd
+
+{{% /capture %}}
+
+{{% capture whatsnext %}}
+* Learn more about [StorageClasses](/docs/concepts/storage/persistent-volumes/).
+{{% /capture %}}
+
+