JS files should be loaded from main app static/js

[totoropy]

Both JS files:
serviceworker.js
webpush.js

should be loaded from main app static/js rather then django_webpush app,
because they need to be customized.

A user can include them like jquery file or so. (just extend readme.md)

[safwanrahman]

You can customize them easily
just create another directory named webpush in your static folder and overwrite the filename to load your webpush.js and others.