This commit sets up webpack as the module bundler along with
configurations for transforming ES6+ code using Babel and compiling SASS
into CSS. It includes necessary dependencies such as `babel-loader`,
`sass-loader`, `css-loader`, `style-loader`, and plugins like
`mini-css-extract-plugin` to extract CSS into separate files. This setup
facilitates the development of a modern web application by enabling the
use of the latest JavaScript features and streamlined CSS
pre-processing.
