feat: Add real-time quiz lobby functionality

- Implement WebSocket-based lobby system for quiz participants
- Add lobby page with real-time participant updates
- Create LobbyConsumer for WebSocket communication
- Add routing configuration for WebSocket connections
- Update requirements with WebSocket dependencies
- Add development and production server documentation

This change enables real-time quiz lobbies where participants can
join and wait for the quiz to start, with instant updates for all
connected users.

django/play/routing.py

@@ -0,0 +1,6 @@
+from django.urls import re_path
+from . import consumers
+
+websocket_urlpatterns = [
+    re_path(r'ws/game/(?P<join_code>\w+)/$', consumers.LobbyConsumer.as_asgi()),
+]