code cleanup

frontend/public/manifest.json

@@ -8,7 +8,6 @@
   "orientation": "any",
   "background_color": "#ffffff",
   "theme_color": "#1a73e8",
-  "gcm_sender_id": "126479377334",
   "icons": [
     {
       "src": "/icons/icon-192.png",
@@ -23,11 +22,18 @@
       "purpose": "maskable"
     },
     {
-      "purpose": "any maskable",
+      "purpose": "maskable",
       "src": "/icons/icon-512-maskable.png",
       "sizes": "512x512",
       "type": "image/png"
       
+    },
+    {
+      "purpose": "any",
+      "src": "/icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+      
     }
   ],
   "min_width": "320px"