feat: Set up NGF integration to N1 Console

[mjang]

Extensively revised (14 Aug, midday), after extensive discussions with @bjee19 , @sylwang , and @sjberman

Proposed changes

Set up NGF integration into N1 Console.

• This is similar to https://docs.nginx.com/nginx-one/k8s/add-nic/
  • But since NIC != NGF, I've changed labels / titles as appropriate
  • I've included some of the same steps to set up a data plane key, create a k8s secret, verify a connection, and for troubleshooting (I'm guessing the troubleshooting section, if applicable, will be different)
• Many of the steps are the same with https://docs.nginx.com/nginx-gateway-fabric/install/helm/
  • I've added an include for one process, I've copy/pasted content with an include for a second process
• I've included temporary references <!-- in comments --> to the UI and steps that we're using in that process

The primary build page is here: https://frontdoor-test-docs.nginx.com/previews/docs/902/nginx-one/k8s/add-ngf/

I think there's work to be done w/r/t data plane keys. We have a bunch of different ways to create them

• There's an alert for when a data plane key is within 30 days of expiration
• This may be best as a separate issue

This might close issue 660.
Closes #ISSUE

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[mjang]

cc @sylwang @bjee19

[sylwang]

In NIC, the doc provided both the Helm and Manifests options for deploying. We'd want to do the same for NGF, and also include an option to deploy NGF using Manifests, as shown in the Figma design.
https://www.figma.com/design/Y0wCtVRjEa08HNfocSDVUb/GA---NGINX-One-SaaS-Console?node-id=8028-37869&t=HQ1wwsiaEMrrHdw9-0

[mjang]

In NIC, the doc provided both the Helm and Manifests options for deploying. We'd want to do the same for NGF, and also include an option to deploy NGF using Manifests, as shown in the Figma design. https://www.figma.com/design/Y0wCtVRjEa08HNfocSDVUb/GA---NGINX-One-SaaS-Console?node-id=8028-37869&t=HQ1wwsiaEMrrHdw9-0

Now that I've re-reviewed the Figma, I need to come up with a new file, probably add-ngf-manifests.md

[bjee19]

lgtm after remaining comments from Saylor are resolved.

[sjberman]

Nice!