chore(nextjs): restore ESLint and Prettier dependencies and scripts

Author: dackers86

examples/nextjs/package.json

@@ -6,7 +6,10 @@
     "dev": "next dev --turbopack",
     "build": "next build",
     "start": "next start",
-    "lint": "next lint"
+    "lint": "next lint",
+    "lint:fix": "next lint --fix",
+    "format": "prettier --write \"**/*.{js,jsx,ts,tsx,json,css,md}\"",
+    "format:check": "prettier --check \"**/*.{js,jsx,ts,tsx,json,css,md}\""
   },
   "dependencies": {
     "@invertase/firebaseui-react": "^0.0.1",