The docs should not describe how to setup 3rd party cloud services

We currently explain the exact commands to setup GKE + AKS clusters in our docs.

This is very risky as these could easily become out-of-date or out-of-sync with the the current installation guides.

We are not experts in these fields and as soon as we include this advice in the docs we become on the hook for maintaining and supporting it. Instead we should just point to the relevant guides to set these up for each cloud vendor. This is already what we do for EKS.

GKE - https://cloud.google.com/kubernetes-engine/docs/how-to/creating-a-cluster
AKS - https://docs.microsoft.com/en-us/azure/aks/kubernetes-walkthrough-portal