Frontend and CSS could use a review

[Wim-De-Clercq]

• CSS is currently still being build with compass which is end of life, no longer supported.
• All of node modules needs to be present in the wheels. This really bloats the wheel but the atramhasis jinja templates look for targets in node_modules, so i can't remove them.
• Also the documentation for customization https://atramhasis.readthedocs.io/en/latest/customisation.html#changing-the-css implies that you have all of the scss files of atramhasis into your own project to edit and build yourself to change to your own styling needs.
  You would have to download the files from github, add them to your project, edit, compile, and then override the css assets. This feels not very user (developer) friendly. Mostly the first step, to get the original scss files either from github or in a cookiecutter doesn't stick well with me.

I think we need to start seeing atramhasis more as a third-party library which you can install, use, and customize. Rather than a github project which you copy/clone the majority of and edit to your needs.