feat: move out of assignments folder

python/assignments/sep30/level1/triangleArea.py python/sep30/level1/triangleArea.py

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 def triangleArea(a: float, b: float, c: float) -> float:
-    """Use herons formula: `sqrt(sp(sp-a)(sp-b)(sp-c))` to calculate the area of a triangle using it's side lengths."""
+    """Use herons formula: `sp = (a+b+c)/2` & `sqrt(sp(sp-a)(sp-b)(sp-c))` to calculate the area of a triangle using it's side lengths."""
     semiperimeter = 0.5 * (a + b + c)
     return sqrt(
         semiperimeter * (semiperimeter - a) * (semiperimeter - b) * (semiperimeter - c)