Coconut Fried Shrimp Tacos

Name: Coconut Fried Shrimp Tacos
Ingredients: 1½ cup thinly sliced red onion; 1 Tbsp. kosher salt, divided; ¼ cup fresh lime juice; 1½ cups all-purpose flour; ¼ cup cornstarch; 1 tsp. dried oregano; ¾ cup light beer; 2 cups sweetened shredded coconut; 1 lb. medium shrimp, peeled and deveined; Six 6-in. flour tortillas, warmed; Habanero salsa (optional), pickled jalapeños, cilantro, shredded red cabbage, and crema or sour cream, for serving; Lime wedges, for serving; Neutral oil, for frying