Before this commit, we did dynamic loader resolution for CSS bundling for resources resolved by Hugo while any fallback to ESBuild would fall back to a (potentially) empty loaders config.
This revises the logic to always use a static list (see below) if `loaders` is not set. This should be easier do document and less confusing for the end user.
````
".png", ".jpg", ".jpeg", ".gif", ".svg", ".webp", ".avif",
".woff", ".woff2", ".ttf", ".eot", ".otf"
````
Fixes#14619
Bjørn Erik Pedersen
a7cbcf15f0