Remove unused files and dependencies, including .gitattributes, App.css, and App.test.js. Update package.json and package-lock.json to remove @radix-ui/react-slot dependency. Modify DataTable component title for clarity and refactor Button component to simplify its implementation.

Remove PostCSS and Tailwind configuration files, and refactor CSS styles in index.css to implement custom styles. Update button and table components to use new class names for styling consistency. Delete utility functions for class name merging.

Initial commit from LLM generated shadcn table logic