Distributing food to the needy is often more problematic than supplying it in Chicago. Good food goes to waste at downtown restaurants because nonprofits, many of which are located on the outskirts of the city, don’t have the resources to go pick up leftovers. So Zero Percent, a startup based at 1871 that coordinates excess food donations and pickups, is launching a new crowdfunding platform to raise money for nonprofits that can’t afford to pay…