Over the past 15 or so years, Shopify Inc. has established itself as the go-to for mom-and-pop businesses looking to set up shop online. Now, in a dramatic shift, the Canadian company is targeting larger companies and, in doing so, looking to wrest e-commerce customers from Salesforce Inc.Shopify says it has lured hundreds of Salesforce clients, including big brands like Mattel Inc., Toys R Us and mattress seller Casper, and is encouraging other companies to “join the mass migration.” Shopify’s ...