Move public bundle from the php site to the hugo site

The bundle of JavaScript, CSS, Fonts, etc., which we expose publicly for other websites to use, is currently hosted on the PHP site.

The problem with hosting the bundle in the PHP site is that there is no build step. We need to commit all the output files from yarn production. This is a problem when we want to include libraries like FontAwesome without redistributing their code and assets.

We do not need to commit these files if we host them on our Hugo site.