Refactoring 🚧

[firasrg]

Hello

According to issue n°26, in spring-petclinic-reactjs repository, we decide to refactor the whole project into a frontend app source files only.

As for backend, we think about using Git Submodules technique to add a third-party repository as a folder, known as spring-petclinic-rest. Because we do not need to repeat it, unless there is a good reason for it!

This task includes rewriting the frontend app to a minimal stable version by upgrading to latest version of React (currently v18), in addition to other libraries and tools.

⚠️It's NOT a full refactoring, we're just looking to set up a stable version to start with. Features like CRUD, search, load, security can be done in some other issues.

Feel free to ask questions or add any thoughts that can support this issue.