fix manifest.json path

index.html

@@ -5,7 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
     <link rel="icon" type="image/svg+xml" href="/icon.svg" />
-    <link rel="manifest" href="manifest.json" />
+    <link rel="manifest" href="/manifest.json" />
     <meta name="theme-color" id="theme-color" content="" />
     <meta name="description" content="Uptime Kuma monitoring tool" />
     <title>Uptime Kuma</title>