Replace gulp-clean-css with postcss-lightningcss #31
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This is a continuation of the problem-solving started in #28 and #29.
gulp-clean-css has probably become stale (with its author completely unresponsive), and while clean-css still is the most downloaded CSS minification package on npm, its author has put the project into "maintenance mode" and will no longer actively work on it.
LightningCSS is a modern take on CSS minification and extremely fast.
Downsides (if used as a postcss plugin):
As it is logical to first purge unused CSS before performing any other transformations on the remaining code, the order of the postcss plugins is adjusted accordingly.