flatten layers parameter structure

Author: mj3cheun

graphistry/kepler.py

@@ -150,7 +150,7 @@ def to_dict(self) -> Dict[str, Any]:
 
         # Merge all config params (columns, visConfig, etc.)
         if self.kwargs:
-            result['config'].update(self.kwargs)
+            result.update(self.kwargs)
 
         return result