See https://github.com/gen2brain/webp

Now, if we then somehow could get rid of libsass we will have a CGO free build (no need for extended), which would be a massive win. We would want to continue producing theextended archives, of course, to make sure we 1. Avoid breaking builds in the wild (e.g. Netlify) and 2. In case we need to re-introduce it in the future.