- Add `mini-css-extract-plugin` to `devDependencies`
- Optimize production builds with `MiniCssExtractPlugin`
- Improve CSS webpack rules for production and development builds
- Improve webpack performance and configuration
- Delete unnecessary CSS and binary files
- Adjust ESLint ignored files list
- Update package.json with webpack mode for dev and prod scripts
- Move app.css to app.js in master.blade.php
