I doubt any resources will teach you how to create boilerplate code for Angular using specifically Webpack or specifically Gulp, (which, might I add, are not entirely overlapping technologies).
Yeoman is a fantastic tool for developing custom project generators.
The Angular team has also recently come out with a tool in the new CLI devkit called Schematics. They are a more sophisticated take on generators. The documentation is more sparse for Schematics, so be aware.