fix(demo): incorrect URL to helm charts location (#2935)

Author: iromli

automation/startjanssendemo.sh

@@ -205,7 +205,7 @@ opendj:
     repository: gluufederation/opendj
     tag: 5.0.0_dev
 EOF
-sudo helm repo add janssen https://docs.jans.io
+sudo helm repo add janssen https://docs.jans.io/charts
 sudo helm repo update
 # remove --devel once we issue the first prod chart
 sudo helm install janssen janssen/janssen --devel -n jans -f override.yaml --kubeconfig="$KUBECONFIG"