Problem:
The existing content is not completely compatible with the 0.6x.x releases of Hugo. Hugo 0.60.0 became compatible with CommonMark. Some existing content doesn't render the same way with Hugo < 0.60.0 as it does with Hugo ≥ 0.60.0

• Some localizations have user-guide-migration-notice.md files that don't render correctly.
• config.toml has configuration that is specific to the BlackFriday renderer for Markdown.
• The code highlighting setup is different
• Pages, including generated documentation, display differently because of changed interpretation of whitespace at the start of lines (indentation)
  Specifically:
  • https://github.com/kubernetes/website/edit/master/content/en/docs/reference/kubectl/kubectl.md
  • https://github.com/kubernetes/website/edit/master/content/en/docs/reference/kubectl/overview.md - The feature state shortcode does not render as expected with Hugo 0.6x.x

This is a tracking issue and will track at least the top 100 most commonly visited pages on this site.

Top 100 pages to check:

• /
• /docs/reference/kubectl/cheatsheet/
• ⚠️ /docs/tasks/tools/install-kubectl/
• /docs/home/
• ⚠️ /docs/concepts/services-networking/service/
• ⚠️ /docs/concepts/workloads/controllers/deployment/
• ⚠️ /docs/concepts/services-networking/ingress/
• ⚠️ /docs/concepts/storage/persistent-volumes/ (feature state only)
• ⚠️ /docs/tasks/tools/install-minikube/ (content in tabs)
• ⚠️ /docs/setup/learning-environment/minikube/
• /docs/tutorials/kubernetes-basics/
• /docs/setup
• ⚠️ /docs/concepts/configuration/secret/ (feature state only)
• ⚠️ /docs/concepts/storage/volumes/ (feature state only)
• /docs/concepts/
• /docs/setup/production-environment/tools/kubeadm/install-kubeadm/
• /docs/concepts/overview/what-is-kubernetes/
• /docs/tasks/configure-pod-container/configure-pod-configmap/
• /docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/
• /docs/reference/access-authn-authz/rbac/
• /docs/tasks/access-application-cluster/web-ui-dashboard/
• /docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/
• /docs/tutorials/
• /docs/concepts/configuration/assign-pod-node/
• /docs/tasks/access-application-cluster/configure-access-multiple-clusters/
• /docs/concepts/overview/components/
• /docs/tutorials/kubernetes-basics/create-cluster/cluster-intro/
• /docs/concepts/services-networking/connect-applications-service/
• /docs/concepts/workloads/pods/pod/
• /docs/concepts/configuration/manage-compute-resources-container/
• /docs/concepts/workloads/controllers/jobs-run-to-completion/
• /docs/concepts/overview/working-with-objects/namespaces/
• /docs/tasks/debug-application-cluster/get-shell-running-container/
• /docs/concepts/containers/images/
• /docs/concepts/workloads/pods/pod-overview/
• /docs/tutorials/hello-minikube/
• /docs/reference/access-authn-authz/authentication/
• /docs/tutorials/kubernetes-basics/deploy-app/deploy-intro/
• /docs/reference/kubectl/overview/
• /docs/concepts/overview/working-with-objects/labels/
• /docs/concepts/workloads/pods/pod-lifecycle/
• /docs/concepts/architecture/nodes/
• /docs/concepts/services-networking/dns-pod-service/
• /docs/reference/
• /docs/tasks/configure-pod-container/pull-image-private-registry/
• /docs/tutorials/kubernetes-basics/create-cluster/cluster-interactive/
• /docs/tasks/configure-pod-container/configure-persistent-volume-storage/
• /docs/tasks/inject-data-application/define-environment-variable-container/
• /docs/tutorials/stateless-application/expose-external-ip-address/
• /docs/setup/production-environment/container-runtimes/
• /docs/tutorials/kubernetes-basics/explore/explore-intro/
• /docs/concepts/workloads/controllers/statefulset/
• /docs/tasks/
• /docs/tasks/run-application/horizontal-pod-autoscale/
• /docs/concepts/storage/storage-classes/
• /docs/tasks/configure-pod-container/configure-service-account/
• /docs/concepts/configuration/taint-and-toleration/
• /docs/concepts/services-networking/network-policies/
• /docs/tasks/configure-pod-container/security-context/
• /docs/concepts/workloads/controllers/replicaset/
• /docs/setup/release/notes/
• /docs/tasks/inject-data-application/define-command-argument-container/
• /docs/concepts/overview/kubernetes-api/
• /docs/concepts/overview/working-with-objects/kubernetes-objects/
• /docs/tasks/access-application-cluster/port-forward-access-application-cluster/
• /docs/tutorials/kubernetes-basics/expose/expose-intro/
• /docs/concepts/services-networking/ingress-controllers/
• /docs/concepts/workloads/pods/init-containers/
• /docs/tutorials/kubernetes-basics/deploy-app/deploy-interactive/
• /docs/concepts/cluster-administration/networking/
• /docs/tasks/job/automated-tasks-with-cron-jobs/
• /case-studies/
• /docs/concepts/workloads/controllers/daemonset/
• /docs/tasks/access-application-cluster/access-cluster/
• /training/
• /docs/concepts/policy/pod-security-policy/
• /docs/concepts/cluster-administration/logging/
• /docs/tasks/run-application/run-stateless-application-deployment/
• /docs/concepts/configuration/organize-cluster-access-kubeconfig/
• /docs/concepts/configuration/overview/
• /docs/concepts/workloads/controllers/cron-jobs/
• /docs/tasks/access-application-cluster/create-external-load-balancer/
• /docs/tasks/administer-cluster/dns-debugging-resolution/
• /docs/tasks/tls/managing-tls-in-a-cluster/
• /docs/setup/production-environment/tools/kubeadm/high-availability/
• /docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/
• /docs/tasks/access-application-cluster/list-all-running-container-images/
• /docs/tutorials/kubernetes-basics/update/update-intro/
• /docs/concepts/extend-kubernetes/api-extension/custom-resources/
• /docs/reference/command-line-tools-reference/kube-apiserver/
• /case-studies/chinaunicom/
• /docs/concepts/cluster-administration/manage-deployment/
• /docs/reference/command-line-tools-reference/kubelet/
• /docs/tasks/administer-cluster/access-cluster-api/
• /docs/tasks/inject-data-application/distribute-credentials-secure/
• /zh/docs/home/
• /zh/
• /docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade/
• /docs/tasks/debug-application-cluster/
• /docs/tutorials/stateful-application/basic-stateful-set/

Additional Information:
This issue heavily draws on work started in PR #19907 (thanks @jimangel!)

#19028 (comment) captures more detail
/kind cleanup
/priority important-longterm