Move settings to a function and add tests

tests/test_main.py

@@ -0,0 +1,13 @@
+from __future__ import annotations
+
+from discord_reminder_bot import main
+
+
+def test_if_send_to_discord_is_in_main() -> None:
+    """send_to_discords needs to be in main for this program to work."""
+    assert hasattr(main, "send_to_discord")
+
+
+def test_if_send_to_user_is_in_main() -> None:
+    """send_to_user needs to be in main for this program to work."""
+    assert hasattr(main, "send_to_user")