Add a named product to the cart from the shop page.
Examples
When I add the product "Ceramic Mug" to the cart
When I add the product "Linen Tote Bag" to the cart
And I add the product "Oak Cutting Board" to the cart
When we add the product "Ceramic Mug" to the cart
When add the product "Linen Tote Bag" to the cart
Pattern
When(/^(I |we )*add the product "([^"]*)?" to the cart$/, …)
Part of @webship-js/squarespace-steps (github.com/webship/squarespace-steps), a step pack for Webship-js 2.0.x.