grafana-cli: add page (#8299)

pages/common/grafana-cli.md

@@ -0,0 +1,12 @@
+# grafana-cli
+
+> A small executable that is bundled with Grafana serve.
+> More information: <https://grafana.com/docs/grafana/latest/cli/>.
+
+- Install, update, or remove specific plugins:
+
+`grafana-cli plugins {{install|update|remove}} {{plugin_id1 plugin_id2 ...}}`
+
+- List all installed plugins:
+
+`grafana-cli plugins ls`