update installation command for openshift (#215)

Author: hadar-co

docs/welcome/getting-started/index.mdx

@@ -165,7 +165,9 @@ Replace `<DATREE_TOKEN>` with the token from your dashboard, and run the followi
     --create-namespace \
     --set datree.token=<DATREE_TOKEN> \
     --set datree.clusterName=$(kubectl config current-context) \
-    --set securityContext.runAsUser=null
+    --set securityContext.runAsUser=null \
+    --set datree.labelKubeSystem=false 
+    kubectl label ns kube-system datree admission.datree/validate=skip --overwrite
 
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