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

app/scheduler.py

@@ -0,0 +1,18 @@
+import logging
+import time
+
+import schedule
+
+from app.api import store_scoreboard_data
+from app.standings import update_nhl_standings
+
+logger = logging.getLogger(__name__)
+
+
+def schedule_tasks():
+    schedule.every(600).seconds.do(update_nhl_standings)
+    schedule.every(10).seconds.do(store_scoreboard_data)
+    logger.info("Background scheduler started")
+    while True:
+        schedule.run_pending()
+        time.sleep(1)