docs: modify prefetch doc

Author: nyqykk

apps/website-new/docs/en/guide/_meta.json

@@ -13,10 +13,5 @@
     "type": "dir",
     "name": "framework",
     "label": "Frameworks"
-  },
-  {
-    "type": "dir",
-    "name": "performance",
-    "label": "Performance"
   }
 ]

apps/website-new/docs/en/guide/performance/prefetch.mdx

@@ -20,5 +20,10 @@
     "name": "scenario",
     "label": "Scenarios",
     "collapsed": true
+  },
+  {
+    "type": "dir",
+    "name": "performance",
+    "label": "Performance"
   }
 ]