chore: Update .env.example and pint.json configurations

- Updated APP_TIMEZONE to Europe/Amsterdam in .env.example
- Changed SESSION_DRIVER from file to database in .env.example
- Modified "preset" value to "laravel" in pint.json

pint.json

@@ -1,3 +1,3 @@
 {
-    "preset": "psr12"
+    "preset": "laravel"
 }