Instant Pot Braised Chicken with Root Vegetables

Name: Instant Pot Braised Chicken with Root Vegetables
Ingredients: 1 chicken, 3 1/2 to 4 lb. (1.75 to 2 kg), cut into 8 pieces; Kosher salt and freshly ground pepper; All-purpose flour for dusting; 2 Tbs. olive oil; 1 yellow onion, diced; 2 celery stalks, diced; 2 tsp. minced garlic; 1 Tbs. tomato paste; 1 tsp. chopped fresh thyme; 1 Tbs. chicken demi-glace; 1 cup (8 fl. oz./250 ml) dry white wine; 1 cup (8 fl. oz./250 ml) chicken broth; 2 carrots, peeled and cut into 2-inch (5-cm) pieces; 2 small rutabagas, peeled and quartered; 2 small turnips, peeled and quartered; 1 bunch Swiss chard, stems removed, leaves cut into strips 1/2 inch (12 mm) wide