Update references to new repo

[lucacome]

Proposed changes

Updates from nginxinc to nginx

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

NGINX Gateway Fabric moved from nginxinc to nginx

[sjberman]

So this PR is not yet updating the image paths to push to the new path, yes? So still pushing to the old one.

[lucacome]

@sjberman I was thinking about doing that in a different PR, but now I realize that the pipeline will probably fail to push edge. I think I should add to this one, thoughts?

[sjberman]

Yeah we probably need to update it now.

We also will need to fix the NFR upgrade tests before code freeze.