fix manifest

public/static/manifest.json

@@ -3,17 +3,17 @@
   "name": "P大树洞",
   "icons": [
     {
-      "src": "/static/favicon/256.png",
+      "src": "favicon/256.png",
       "sizes": "256x256",
       "type": "image/png"
     },
     {
-      "src": "/static/favicon/192.png",
+      "src": "favicon/192.png",
       "sizes": "192x192",
       "type": "image/png"
     }
   ],
-  "start_url": "/?app",
+  "start_url": "../",
   "display": "standalone",
   "theme_color": "#112244",
   "background_color": "#112244"