Update Ubuntu docs (#13594)

* update links to point to official docs

* delete unmaintained content

* Add page to retain url and direct readers to appropriate docs

content/en/docs/getting-started-guides/ubuntu.md

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+---
+title: Kubernetes on Ubuntu
+content_template: templates/concept
+---
+
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+There are multiple ways to run a Kubernetes cluster with Ubuntu on public and
+private clouds, as well as bare metal.
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+## The Charmed Distribution of Kubernetes(CDK)
+
+[CDK](https://www.ubuntu.com/cloud/kubernetes) is a distribution of Kubernetes
+packaged as a bundle of *charms*  for Juju, the open source application modeller.
+
+CDK is the latest version of Kubernetes with upstream binaries, packaged in a format
+which makes it fast and easy to deploy. It supports various public
+and private clouds including AWS, GCE, Azure, Joyent, OpenStack, VMware, Bare Metal
+and localhost deployments.
+
+See the [Official documentation](https://www.ubuntu.com/cloud/kubernetes/docs) for
+more information.
+
+## MicroK8s
+
+[MicroK8s](https://microk8s.io) is a minimal install of Kubernetes designed to run locally.
+It can be installed on Ubuntu (or any snap enabled operating system) with the command:
+
+```shell
+snap install microk8s --classic
+```
+
+Full documentation is available on the [MicroK8s website](https://microk8s.io/docs)
+
+
+
+
+
+
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