Before HOL and HOL Guides not updated to supported version of AKS

[abarrionuevodevops]

When installing by the Before HOL guide, the deployment failed, because AKS version 1.15.2 (included in the ARM template) is no longer supported for region East US.
I were able to deploy after changing that value in the azuredeploy.json to a supported version like 1.17.9
And then, while running a HOL guide test drive, there are a couple of tasks related to Kubernetes Dashboard, which is no longer available in current versions of AKS

[snpdev]

My understanding if that the up-to-date lab content is found at https://github.com/microsoft/MCW-Cloud-native-applications.

Issue #11 mentions this.

I only came to this repo because it was referenced as the Workshop Asset in the "AIW workshop partner call 9-2-2020" PowerPoint presented to partners.

@KirillKotlyarenko, can you comment on this, please?