installer: added support/help link for ARP

Change-Id: I2b2e37541c80d23ba60f18b542c785d541544abd
Reviewed-on: http://gerrit.esdi-community.eu/3174
Tested-by: Jenkins <sitemple@igd.fraunhofer.de>
Reviewed-by: Simon Templer <simon.templer@igd.fraunhofer.de>