feat: implement JS and CSS minification

[ayshrj]

This pull request introduces robust minification tools for JavaScript and CSS, aiming to enhance the performance of web applications by reducing the size of these assets. Leveraging the capabilities of the clean-css library for CSS and terser for JavaScript, these tools ensure efficient compression techniques that strip unnecessary characters and comments while preserving the functionality of the code.

Key Components of This Feature:

• JavaScript Minification with Terser: Implements the terser library to minify JavaScript files, effectively removing whitespace, comments, and other non-essential characters, ensuring that the output is as compact as possible without sacrificing functionality.
• CSS Minification with Clean-CSS: Utilizes the clean-css library to compress CSS files, enhancing load times and reducing bandwidth usage by optimizing the CSS in a way that also considers mobile and web performance best practices.
• Testing: Includes comprehensive tests to verify that the minification processes maintain the integrity of the code and effectively reduce file sizes. These tests ensure that both JavaScript and CSS files are processed correctly and that their functionality remains intact after minification.