Refer to kubernetes/community as authoritative source for code of conduct

[spiffxp]

There are miscellaneous copies of a code-of-conduct.md file scattered across repos in kubernetes and kubernetes-incubator. I'd like to change them to a redirect to the code-of-conduct.md file living in this repo as the authoritative source.

kubernetes/cluster-registry/code-of-conduct.md
kubernetes/community/code-of-conduct.md
kubernetes/dns/code-of-conduct.md
kubernetes/frakti/code-of-conduct.md
kubernetes/gengo/code-of-conduct.md
kubernetes/git-sync/code-of-conduct.md
kubernetes/heapster/code-of-conduct.md
kubernetes/helm/code-of-conduct.md
kubernetes/ingress-nginx/code-of-conduct.md
kubernetes/k8s.io/code-of-conduct.md
kubernetes/kompose/code-of-conduct.md
kubernetes/kops/code-of-conduct.md
kubernetes/kubeadm/code-of-conduct.md
kubernetes/kubectl/code-of-conduct.md
kubernetes/kubernetes-template-project/code-of-conduct.md
kubernetes/metrics/code-of-conduct.md
kubernetes/minikube/code-of-conduct.md
kubernetes/perf-tests/code-of-conduct.md
kubernetes/utils/code-of-conduct.md
kubernetes-incubator/bootkube/code-of-conduct.md
kubernetes-incubator/client-python/code-of-conduct.md
kubernetes-incubator/cluster-proportional-autoscaler/code-of-conduct.md
kubernetes-incubator/cluster-proportional-vertical-autoscaler/code-of-conduct.md
kubernetes-incubator/cri-containerd/code-of-conduct.md
kubernetes-incubator/cri-o/code-of-conduct.md
kubernetes-incubator/cri-tools/code-of-conduct.md
kubernetes-incubator/custom-metrics-apiserver/code-of-conduct.md
kubernetes-incubator/descheduler/code-of-conduct.md
kubernetes-incubator/external-dns/code-of-conduct.md
kubernetes-incubator/external-storage/code-of-conduct.md
kubernetes-incubator/ip-masq-agent/code-of-conduct.md
kubernetes-incubator/kube-arbitrator/code-of-conduct.md
kubernetes-incubator/kube-aws/code-of-conduct.md
kubernetes-incubator/kubespray/code-of-conduct.md
kubernetes-incubator/metrics-server/code-of-conduct.md
kubernetes-incubator/nfs-provisioner/code-of-conduct.md
kubernetes-incubator/node-feature-discovery/code-of-conduct.md
kubernetes-incubator/rktlet/code-of-conduct.md
kubernetes-incubator/service-catalog/code-of-conduct.md
kubernetes-incubator/spartakus/code-of-conduct.md

See kubernetes/kubernetes-template-project#13 for an example of what I'd like to use

There is also the question of whether repos that currently lack a code-of-conduct.md should have one.

/assign
/sig contributor-experience

[jbeda]

SGTM

[cblecker]

I support this 👍