Add authentication and test

[miku0129]

1. Add authentication to create/update/remove etudiant of a user.

   • Use Hanko for authenticaiton.
   • Separate form component to reuse in other component.
   • Add .env value to production environment.

2. Perform unit tests and calculate test coverage.

   • Set up testable environment.
   • Implemented unit test.
   • Add test coverage.