Pizza Bianca with Scamorza and Shaved Celery Root

Name: Pizza Bianca with Scamorza and Shaved Celery Root
Ingredients: ¼ bulb celery root (celeriac), peeled, very thinly sliced; 2 tablespoons olive oil, divided, plus more for baking sheet; Kosher salt and freshly ground black pepper; 8 oz. prepared pizza dough, room temperature; 6 oz. scamorza cheese or smoked mozzarella, thinly sliced; ½ small red onion, very thinly sliced; ½ cup grated Parmesan; 1 tablespoon fresh oregano leaves, plus more for serving; 1 tablespoon drained capers, chopped; Flaky sea salt (such as Maldon)