Add a document about how to get support

[Jcahilltorre]

Proposed changes

AC:
Create a page that explains how to contact NGINX for support.

(Commercial options removed from the AC for now)

cc @ADubhlaoich @brianehlert

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[pleshakov]

we also will need to update README https://github.com/nginxinc/nginx-gateway-fabric#support

[sjberman]

If this is ready for review, can the PR title and description be updated to remove draft status?

[ADubhlaoich]

LGTM. Simple but effective.

I still like the guidance on how to ask for help, but it's understandably somewhat out of scope.