Hi!
I nearly got this working. Even with a webpack-dev-server with https and certificate stuff, but then I walked into a problem with hot module reloading and "background-image: url(/img/header1.jpg)" in homepage.pcss.
I cannot get these ones to work:
url(/dist/img/header1.jpg)
url(/img/header1.jpg)
url(../img/header1.jpg)
url(../../img/header1.jpg)
url(/src/img/header1.jpg)
Referencing this issue https://github.com/nystudio107/craft/issues/27 here