Updated broken trailhead link on getting started page
Updated broken trailhead link on getting started page

SalesforceFoundation/Cumulus,SalesforceFoundation/Cumulus,Zosoled/Cumulus,SalesforceFoundation/Cumulus,Zosoled/Cumulus,Zosoled/Cumulus,SalesforceFoundation/Cumulus,Zosoled/Cumulus