Changed AKS deployment instructions

[paolosalvatori]

Hi folks

I changed a little bit the page which contains the instructions to deploy AKS on Azure. Still, I'd like to have a call with you, even next week, to understand a little bit more to better understand how to configure RBAC. I changed contents, snippets of bash code, and added references.

I also have a few comments on the picture:

• You should change the Azure logo in the picture and adopt the latest one.
• If you can try to shrink the resource group virtual network and subnet frames in the picture so that the Kubernetes entities can be read more clearly.
• Usually the resource group is represented in architecture diagrams, so you can eliminate it

[mendrugory]

Thank you very much @paolosalvatori for your contribution and your comments. I will open an "issue" in order to take care of your comments