Azure Setup: Expanding documentation to include further steps

[Khabera]

Important notices

• I have read the contributing guide lines at https://github.com/opnsense/docs/blob/master/CONTRIBUTING.md
• I have searched the existing issues and I am convinced that mine is new.

Is your feature request related to a problem? Please describe.

I found the documentation on an azure deployment to be somewhat minimal and doesn't leave off in a great position to use the device as a NVA in Azure for most expected purposes. I talked to a colleague who has also deployed an OpnSense firewall in Azure before and they reported a similar experience.

Doc referenced: https://docs.opnsense.org/manual/how-tos/installazure.html

Describe the solution you like

I would like to write some documentation to to fill in the gap, but wanted to confirm this was desired. If so, I can submit an example setup using two devices/nics and applicable routing configuration.

Describe alternatives you considered

Alternatively, just adding some "leading" documentation links, that would provide the Microsoft Learn articles to a user for things that will be needed to further the setup, as well as a note about the context of the configuration the marketplace offering will result in could be beneficial.

Additional context

I found a Howto from the forum but it is old and doesn't reference the marketplace deployment specifically (which I assume would be the preferred deployment starting point.) https://forum.opnsense.org/index.php?topic=5841.0

[AdSchellevis]

@Khabera I'm sure we can find a spot in our documentation to explain these use-cases, just open a PR and we can discuss details.