chore: Move liveReload code into script.

demos/dev/reload.js

@@ -0,0 +1,22 @@
+// Connect to the server and reload the page if the server sends a reload message
+const connectToEvents = () => {
+  const events = new EventSource('/events');
+  const loadTime = Date.now();
+  events.onmessage = (event) => {
+    const time = JSON.parse(event.data);
+    if (time && time > loadTime) {
+      location.reload();
+    }
+  };
+  events.onerror = (error) => {
+    console.error(error);
+    events.close();
+    // Try to reconnect after 1 second in case of errors
+    setTimeout(connectToEvents, 1000);
+  };
+  events.onopen = () => {
+    console.log('Connected to live reload server');
+  };
+};
+
+setTimeout(connectToEvents, 500);