next.js

832cbb33 - chore: migrate `basic-css` example from page router to app router (#62980)

chore: migrate `basic-css` example from page router to app router (#62980) ### Adding or Updating Examples Migrate the basic-css example from page router to app router. If it needs further updates, Please let me know Happy to contribute --------- Co-authored-by: Steven <steven@ceriously.com>