Convert site to Hugo (#8316)

This commit converts content and layout to use Hugo.

content/en/docs/reference/setup-tools/kubeadm/kubeadm-config.md

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+---
+approvers:
+- mikedanese
+- luxas
+- jbeda
+title: kubeadm config
+content_template: templates/concept
+---
+{{% capture overview %}}
+Beginning with v1.8.0, kubeadm uploads the configuration of your cluster to a ConfigMap called 
+`kubeadm-config` in the `kube-system` namespace, and later reads the ConfigMap when upgrading.
+This enables correct configuration of system components, and provides a seamless user experience.
+
+You can execute `kubeadm config view` to view the ConfigMap. If you initialized your cluster using
+kubeadm v1.7.x or lower, you must use `kubeadm config upload` to create the ConfigMap before you
+may use `kubeadm upgrade`.
+
+{{% /capture %}}
+
+{{% capture body %}}
+## kubeadm config upload from-file {#cmd-config-from-file}
+{{< include "generated/kubeadm_config_upload_from-file.md" >}}
+
+## kubeadm config upload from-flags {#cmd-config-from-flags}
+{{< include "generated/kubeadm_config_upload_from-flags.md" >}}
+
+## kubeadm config view {#cmd-config-view}
+{{< include "generated/kubeadm_config_view.md" >}}
+{{% /capture %}}
+
+{{% capture whatsnext %}}
+* [kubeadm upgrade](kubeadm-upgrade.md) to upgrade a Kubernetes cluster to a newer version
+{{% /capture %}}
+