remove k3s and rke2 from the docs for now

Author: AshleyDumaine

docs/src/SUMMARY.md

@@ -21,9 +21,7 @@
       - [Etcd Backup](./topics/flavors/etcd-backup-restore.md)
       - [Etcd-disk](./topics/flavors/etcd-disk.md)
       - [Flatcar](./topics/flavors/flatcar.md)
-      - [k3s](./topics/flavors/k3s.md)
       - [konnectivity (kubeadm)](./topics/flavors/konnectivity.md)
-      - [rke2](./topics/flavors/rke2.md)
       - [vpcless](./topics/flavors/vpcless.md)
     - [Linode Cloud Controller Manager](./topics/linode-cloud-controller-manager.md)
     - [Machine Health Checks](./topics/health-checking.md)