Documentation recommends ingress-nginx but it's going end of life

[jabbera]

As of March 2026 ingress-nginx won't be supported: https://www.kubernetes.dev/blog/2025/11/12/ingress-nginx-retirement

This is documented here:

zero-to-jupyterhub-k8s/docs/source/administrator/advanced.md

Line 25 in 645094d

[ingress-nginx](https://github.com/kubernetes/ingress-nginx/blob/HEAD/docs/deploy/index.md#using-helm).