Bundle using Webpack 4.x

[georgwittberger]

Improvement

The final JavaScript bundle should be produced with Webpack 4.x instead of Rollup + Uglify in separate steps.

jQuery can be externalized like this: https://webpack.js.org/configuration/externals/

Reasons

Webpack seems to be the more adopted solution for module bundling on the market. Therefore, the example project will be more attractive for a broader audience when using Webpack.

[georgwittberger]

Won't be changed because this example project is considered discontinued.