update manifest

public/manifest.json

@@ -10,13 +10,13 @@
   "start_url": "/editor",
   "icons": [
     {
-      "src": "/assets/192.png",
+      "src": "assets/192.png",
       "sizes": "192x192",
       "type": "image/png"
     },
 
     {
-      "src": "/assets/512.png",
+      "src": "assets/512.png",
       "sizes": "512x512",
       "type": "image/png"
     }