Saba Grocers Initiative plans to launch a community-owned  food hub by March to distribute fresh local and affordable food to 50 corner stores, schools, hospitals, and food banks across Alameda County. But to fully realize its vision, Saba is asking the community to help raise $1.5 million. In September, the nonprofit received a $2 million grant from the California Department of Food and Agriculture’s Farm to Community Food Hubs program as part of a $13.8 million investment  in food system infrastructure…