Write the how-to guide for DNS configuration on Azure

### Context

Users use Kubeflow on Azure. This guide with help them with the DNS configuration of the platform.

### What needs to get done

Write the how-to guide based on the exploration done #953

### Definition of Done

The how-to guide is approved and published

Start by reading the exploration in issue #953 and use it as the basis for the Azure DNS configuration how-to guide. Identify the appropriate documentation location from the repository, then ensure the guide is approved and published to meet the stated definition of done.

Written by the indexing model from the issue text.