Across the South, small-batch baking businesses are quietly transforming the market one baked good at a time.Credit: Yukiya BakeryMicro-bakeries are not new, but they’re growing across the South as quickly as a sourdough starter. These aren't your typical brick-and-mortar stores. Rather, they’re businesses where baked goods are made in small batches with a lot of heart. The owners usually run their operations from shared kitchen spaces or out of…