feat: make it web/pygbag deploy compatible

main.py

@@ -3,17 +3,18 @@
     https://strategywiki.org/wiki/Tetris/Getting_Started
     https://tetris.com/play-tetris
 '''
-
+import asyncio
 from tetri5.game import Game
 from tetri5.util import ConfigurationManager
 
-def main() -> None:
+async def run_game():
     ConfigurationManager.init()
     Game.init()
 
     while True:
         Game.update()
         Game.draw()
+        await asyncio.sleep(0)  # yield control to browser
 
 if __name__ == "__main__":
-    main()  
+    asyncio.run(run_game())