Add K8sOnWindows alternative to Azure

Milage may vary but I want to provide a free alternative to Azure
and also start working more with this project. Ideally we'll
eventually typically run our smoke tests for Windows using this
project.

Fixes broken link as well.

Signed-off-by: John Schnake <[email protected]>

site/content/posts/2021-06-21-windows-e2e.md

@@ -29,6 +29,8 @@ But if you are curious what these plugins are doing differently and how Windows
 
 If you would like to run Sonobuoy from a Windows node, you need to set up a Kubernetes cluster with Windows nodes. One of the easiest ways to get started is to use an Azure account and create an AKS cluster. It is easy but does require an account and costs based on resources used. Find more instructions [here](https://docs.microsoft.com/en-us/azure/aks/windows-container-cli).
 
+You can also set up a cluster using Vagrant and [FriedrichWilken/KubernetesOnWindows][k8sonwindows]. This way, you avoid setting up extra accounts and incurring fees.
+
 For the purposes of this blog post, you can start with a 2 node cluster:
 - 1 control plane, Linux node 
 - 1 Windows node for workloads
@@ -143,7 +145,8 @@ If telling us these things is good, helping us actually build or test them is ev
 
 [sonobuoy]: https://github.com/vmware-tanzu/sonobuoy
 [sonobuoy-plugins]: https://github.com/vmware-tanzu/sonobuoy-plugins
-[winE2EPlugins]: https://github.com/vmware-tanzu/sonobuoy-plugins/windows-e2e
+[winE2EPlugins]: https://github.com/vmware-tanzu/sonobuoy-plugins/tree/master/windows-e2e
 [lastBlog]: https://sonobuoy.io/sonobuoy-adds-windows-support/
 [windowsTesting]: https://github.com/kubernetes-sigs/windows-testing
 [windowsTestingRegistries]: https://github.com/kubernetes-sigs/windows-testing/tree/master/images
+[k8sonwindows]: https://github.com/FriedrichWilken/KubernetesOnWindows