Add Grafana and Prometheus install to Docs

[suse-coder]

As many need that and it is a very easy way to have all preinstalled Grafana Dashboards to see it would be great if there is in the docs (like metric-server) a section for that so new users can easily install and dont walk into problems that for example they have to set priviledge label for the ns.

helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm repo update

kubectl create ns monitoring
kubectl label namespace monitoring pod-security.kubernetes.io/enforce=privileged --overwrite

# install the stack
helm install kp prometheus-community/kube-prometheus-stack \
  --namespace monitoring --create-namespace \
  --set prometheus.prometheusSpec.maximumStartupDurationSeconds=60