refactor: flatten app/scoreboard/ subpackage and rename files for clarity

run.py

@@ -1,9 +1,9 @@
 import threading
 from app import app
 from app.config import PORT
-from app.scoreboard.tasks import schedule_tasks
-from app.scoreboard.get_data import store_scoreboard_data
-from app.scoreboard.update_nhl_standings_db import update_nhl_standings
+from app.scheduler import schedule_tasks
+from app.api import store_scoreboard_data
+from app.standings import update_nhl_standings
 from waitress import serve
 
 if __name__ == "__main__":