k3s: add page (#16772)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: Wiktor Perskawiec <wiktor@perskawiec.cc>

Author: 4 people

pages/common/k3s.md

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+# k3s
+
+> Install and manage lightweight Kubernetes clusters.
+> More information: <https://docs.k3s.io/cli>.
+
+- Run the embedded `kubectl` command:
+
+`k3s kubectl get nodes`
+
+- Take an etcd snapshot of the cluster:
+
+`k3s etcd-snapshot save`
+
+- Rotate the CA certificate:
+
+`k3s certificate rotate-ca`
+
+- Manage bootstrap tokens:
+
+`k3s token list`
+
+- Uninstall K3s and remove all components:
+
+`k3s-uninstall.sh`