The most basic version of this would be an Google Maps embed, but you'll quickly run into styling and interaction limitations.

Not the author, but McBroken looks to be built with Mapbox's Javascript library, so you'll need to break out a text editor. They have some good starter docs here:

https://docs.mapbox.com/mapbox-gl-js/example/simple-map/

You can learn a lot by signing up for an API key from Mapbox and tweaking their example code. They even provide online editors so you don't even need to work with an HTML file locally (though I'd still recommend that for permanence). No React, no Webpack needed!