added ("layer_manager")

pages/05_GOES_NBR.py

@@ -13,6 +13,7 @@ class Map(geemap.Map):
     def __init__(self, **kwargs):
         super().__init__(**kwargs)
         self.add_ee_data()
+        self.add("layer_manager")
 
     def add_ee_data(self):
         def calc_nbr(pre_start, pre_stop, post_start, post_stop, bbox):