Fix error handling in index.html

Author: Drarig29

demo/index.html

@@ -7,11 +7,12 @@
 
 <script>
     (async function () {
-        const stage = (await fetch('http://localhost:3000/stage?number=1').then(res => res.json()))[0];
-        const data = await fetch('http://localhost:3000/db').then(res => res.json());
+        const data = await fetch('http://localhost:3000/db')
+            .catch(() => alert('Failed to fetch localhost. Please do `npm run db` or use json-server your own way.'))
+            .then(res => res.json());
 
         bracketsViewer.render('#root', {
-            stage,
+            stage: data.stage[0],
             groups: data.group,
             rounds: data.round,
             matches: data.match,
@@ -23,7 +24,5 @@
             showLowerBracketSlotsOrigin: true,
             highlightParticipantOnHover: true,
         });
-    })().catch(() => {
-        alert('Failed to fetch localhost. Please do `npm run db` or use json-server your own way.');
-    });
+    })()
 </script>