fix: favicon path in examples

Author: foryuki

examples/.storybook/manager-head.html

@@ -1,4 +1,4 @@
 <script>
   document.title = "One React"
 </script>
-<link rel="icon" type="image/png" href="/favicon.png">
+<link rel="icon" type="image/png" href="favicon.png">