fix PWA

package.json

@@ -19,7 +19,19 @@
     "react-lazyload": "^3.2.0",
     "react-polls": "^1.2.0",
     "react-scripts": "5.0.1",
-    "react-timeago": "^7.1.0"
+    "react-timeago": "^7.1.0",
+    "workbox-background-sync": "^6.4.2",
+    "workbox-broadcast-update": "^6.4.2",
+    "workbox-cacheable-response": "^6.4.2",
+    "workbox-core": "^6.4.2",
+    "workbox-expiration": "^6.4.2",
+    "workbox-google-analytics": "^6.4.2",
+    "workbox-navigation-preload": "^6.4.2",
+    "workbox-precaching": "^6.4.2",
+    "workbox-range-requests": "^6.4.2",
+    "workbox-routing": "^6.4.2",
+    "workbox-strategies": "^6.4.2",
+    "workbox-streams": "^6.4.2"
   },
   "scripts": {
     "start": "react-scripts start",