build: remove @react-firebase/database

Author: raduwen

package.json

@@ -13,7 +13,6 @@
   },
   "dependencies": {
     "@material-ui/core": "^4.12.3",
-    "@react-firebase/database": "^0.3.11",
     "firebase": "^8.9.1",
     "next": "^11.1.2",
     "react": "^17.0.2",