N1 Console docs. Inconsistent approach between NIC and NGF

[mjang]

@mjang I noticed this PR has two separate pages for Helm and Manifest configurations. The NGINX Ingress Controller documentation has settings for Helm and Manifest in the same page separated by tabs

Is there a reason we are not following the same approach for this documentation?

NGF integration has different options for NGINX OSS and NGINX Plus. That would have required "tabs within tabs" which don't seem to work with our build.

I need to go back and evaluate these docs for consistency. Maybe we should set up two separate pages for NIC integration.

Originally posted by @mjang in #902 (comment)