break: enhance server message structure and settings

- add explicit server messages for start and end
- include pomodoro setttings in server messages
- update README

🤖

index.html

@@ -65,7 +65,7 @@
 			var data = JSON.parse(event.data);
 			var mode = data.mode;
 			var session = data.session;
-			var totalSession = data.total_sessions;
+			var totalSession = data.settings.sessions;
 			var timeLeft = data.time_left;
 
 			document.getElementById("timer").innerText =