CSS page outdated, new recipe style page needed.

[jensens]

In Plone 5 docs the page describing how to add a simple CSS file is outdated. http://docs.plone.org/adapt-and-extend/theming/templates_css/css.html

I think we need a recipe for the use case like so:

A developer:

• writes new addon
• want to add some simple custom css (like very few lines supporting his views, maybe an icon for controlpanel or some icons for the custom content type)

We need 3 to 5 simple steps describing how to add it.

[jensens]

BTW.: http://docs.plone.org/adapt-and-extend/theming/resourceregistry.html does not explain it. Its also not only about theming, but about addon development. See also https://community.plone.org/t/strategies-for-less-css-in-addons/1137