Move kubelet authentication/authorization out of CLI reference dir

The `kubelet-authentication-authorization` and the `kubelet-tls-bootstrapping`
pages do not belong to `reference/command-line-tools-reference` topic.
This PR moves them into `reference/access-authn-authz` subdirectory
which is a better fit.
The `static/_redirects` file is updated to point to the new location.

Author: tengqm

content/en/docs/reference/access-authn-authz/_index.md

@@ -24,3 +24,5 @@ Reference documentation:
 - Service accounts
   - [Developer guide](/docs/tasks/configure-pod-container/configure-service-account/)
   - [Administration](/docs/reference/access-authn-authz/service-accounts-admin/)
+- [Kubelet Authentication & Authorization](/docs/reference/access-authn-authz/kubelet-authn-authz/)
+  - including kubelet [TLS bootstrapping](/docs/reference/access-authn-authz/kubelet-tls-bootstrapping/)

content/en/docs/reference/command-line-tools-reference/kubelet-authentication-authorization.md renamed to content/en/docs/reference/access-authn-authz/kubelet-authn-authz.md

@@ -41,8 +41,8 @@
 /docs/admin/ha-master-gce/     /docs/setup/production-environment/#production-control-plane 301
 /docs/admin/ha-master-gce.md/     /docs/setup/production-environment/#production-control-plane 301
 /docs/admin/high-availability/      /docs/setup/production-environment/tools/kubeadm/high-availability/   301
-/docs/admin/kubelet-authentication-authorization/     /docs/reference/command-line-tools-reference/kubelet-authentication-authorization/ 301
-/docs/admin/kubelet-tls-bootstrapping/     /docs/reference/command-line-tools-reference/kubelet-tls-bootstrapping/ 301
+/docs/admin/kubelet-authentication-authorization/     /docs/reference/access-authn-authz/kubelet-authn-authz/ 301
+/docs/admin/kubelet-tls-bootstrapping/     /docs/reference/access-authn-authz/kubelet-tls-bootstrapping/ 301
 /docs/admin/limitrange/     /docs/tasks/administer-cluster/cpu-memory-limit/ 301
 /docs/admin/limitrange/Limits/     /docs/tasks/administer-cluster/limit-storage-consumption/#limitrange-to-limit-requests-for-storage/ 301
 /docs/admin/master-node-communication/     /docs/concepts/architecture/master-node-communication/ 301
@@ -250,7 +250,7 @@
 /docs/tasks/administer-cluster/apply-resource-quota-limit/     /docs/tasks/administer-cluster/quota-api-object/ 301
 /docs/tasks/administer-cluster/assign-pods-nodes/     /docs/tasks/configure-pod-container/assign-pods-nodes/ 301
 /docs/tasks/administer-cluster/calico-network-policy/     /docs/tasks/administer-cluster/network-policy-provider/calico-network-policy/ 301
-/docs/tasks/administer-cluster/certificate-rotation/     /docs/reference/command-line-tools-reference/kubelet-tls-bootstrapping/ 301
+/docs/tasks/administer-cluster/certificate-rotation/     /docs/reference/access-authn-authz/kubelet-tls-bootstrapping/ 301
 /docs/tasks/administer-cluster/cilium-network-policy/     /docs/tasks/administer-cluster/network-policy-provider/cilium-network-policy/ 301
 /docs/tasks/administer-cluster/configure-namespace-isolation/     /docs/concepts/services-networking/network-policies/ 301
 /docs/tasks/administer-cluster/configure-multiple-schedulers/     /docs/tasks/extend-kubernetes/configure-multiple-schedulers/ 301