Migrate from moment to date-fns and some changes

frontend/package.json

@@ -9,19 +9,16 @@
     "@testing-library/react": "^9.5.0",
     "@testing-library/user-event": "^7.2.1",
     "axios": "^0.19.2",
+    "date-fns": "^2.14.0",
     "dotenv": "^8.2.0",
     "emoji-mart": "^3.0.0",
-    "moment": "^2.26.0",
-    "moment-timezone": "^0.5.31",
     "qrcode.react": "^1.0.0",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
     "react-infinite-scroll-reverse": "^1.0.3",
     "react-modal-image": "^2.5.0",
-    "react-moment": "^0.9.7",
     "react-router-dom": "^5.2.0",
     "react-scripts": "3.4.1",
-    "react-toastify": "^6.0.4",
     "socket.io-client": "^2.3.0"
   },
   "scripts": {