cleanup: Remove unused script stub

Removed __main__ block not used fot script execution.

Author: akiels

maths/monte_carlo.py

@@ -171,9 +171,3 @@ def semicircle_function(x: float) -> float:
     error = abs(estimated_value - expected_value)
 
     return estimated_value, expected_value, error
-
-
-if __name__ == "__main__":
-    import doctest
-
-    doctest.testmod()