Update image paths in manifest.json

public/manifest.json

@@ -3,17 +3,17 @@
     "short_name": "GSC Boilerplate",
     "icons": [
         {
-            "src": "img/favicon.ico",
+            "src": "/favicon.ico",
             "sizes": "32x32",
             "type": "image/x-icon"
         },
         {
-            "src": "/img/android-chrome-192x192.png",
+            "src": "/android-chrome-192x192.png",
             "sizes": "192x192",
             "type": "image/png"
         },
         {
-            "src": "/img/android-chrome-512x512.png",
+            "src": "/android-chrome-512x512.png",
             "sizes": "512x512",
             "type": "image/png"
         }