Implement CSS minification

RoneoOrg commented 3 years ago

This branch is an implementation of this feature.

Key advantages:

every single CSS file is now minified
half of them are also concatenated
as the minification is done on the fly, previously minified files are now shipped unminified. The CSS files are easier to analyze and customize

The default behavior is set to use selfHosted files instead of CDNs, as it's required to take advantage of the minification.

Carefully tested with: Hugo 0.56 basic , Hugo 0.80.0 basic and Hugo 0.80.0 extended

RoneoOrg commented 3 years ago

The CSS used in shortcodes in now minified too

RoneoOrg commented 3 years ago

TODO: Potential improvement: make the minification optional via a Param in config.toml

halogenica / beautifulhugo