Minikube externaldns + coredns documentation is out of date

[k8s-1]

What happened:
Followed https://github.com/kubernetes-sigs/external-dns/blob/master/docs/tutorials/coredns.md, starting with the install of etcd-operator. The helm chart no longer exists so I checked out coreos/etcd-operator.

There, I discovered that the etcd-operator repository has been in archive-mode since 2020, e.g. applying example resources from this repository using deprecated kubernetes api resources:
resource mapping not found for name: "etcd-operator" namespace: "" from "cluster-role.yaml": no matches for kind "ClusterRole" in version "rbac.authorization.k8s.io/v1beta1"

What you expected to happen:
No errors, coredns and external-dns deployed.

How to reproduce it (as minimally and precisely as possible):
Follow coreDNS + external-dns minikube documentation
Client Version: v1.30.3
Kustomize Version: v5.0.4-0.20230601165947-6ce0bf390ce3
Server Version: v1.31.0

Anything else we need to know?:
etcd-operator has been archived since 2020

Environment:
n/a since I could not install anything

[k8s-1]

/label docs

[k8s-ci-robot]

@k8s-1: The label(s) /label docs cannot be applied. These labels are supported: api-review, tide/merge-method-merge, tide/merge-method-rebase, tide/merge-method-squash, team/katacoda, refactor. Is this label configured under labels -> additional_labels or labels -> restricted_labels in plugin.yaml?

In response to this:

/label docs

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