docs(README): updated the readme to include Vite from CRA

[AbhishekPAnil]

This pull request updates the README.md to reflect the migration from Create React App to Vite and to provide clearer, more comprehensive documentation for setup, development, and build processes. The changes modernize the tech stack documentation, clarify available scripts, and add instructions for linting and formatting.

Documentation and tech stack updates:

• Updated the tech stack section to specify React 18, Vite 7, React Router, Redux Toolkit with RTK Query, and Ant Design, replacing the previous Create React App reference.
• Added prerequisite section specifying Node.js and npm requirements.
• Rewrote setup, development, build, and preview instructions to use Vite commands and scripts, including mode-specific scripts for staging and production.
• Added instructions for linting and formatting using npm scripts.

Project structure update:

• Updated the project structure section to include the vite.config.js file, reflecting the switch to Vite.

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