Provide a React app template for `npm create` to simplify new project setup

[cheton]

Setting up a new React app currently requires multiple manual steps, such as configuring Tonic One, themes, and build tools. To streamline this process, we should provide a ready-to-use template: @tonic-ui/react-app, which can be initialized via npm create.

Example usage:

npm create @tonic-ui/react-app@latest my-app