refactor!: restructure project files and modules

main.py

@@ -4,20 +4,18 @@
     https://tetris.com/play-tetris
 '''
 
-# TODO review imports to make sure it is being done correctly
-
-from Tetris import Tetris
-from util.ConfigurationManager import ConfigurationManager
+from tetris.game import Game
+from tetris.util import ConfigurationManager
 
 def main() -> None:
     ConfigurationManager.load()
 
-    tetris = Tetris()
-    tetris.initialize()
+    game = Game()
+    game.initialize()
 
     while True:
-        tetris.update()
-        tetris.draw()
+        game.update()
+        game.draw()
 
-# start main function
-main()  
+if __name__ == "__main__":
+    main()