Add Rust-based transformer/packager/optimizer for HTML and SVG #10090
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This replaces the posthtml-based transformer/packager/optimizer with a Rust-based one powered by html5ever, the HTML parser from Servo. For SVG optimization, it uses oxvg, an SVGO replacement written in Rust which uses Lightning CSS for CSS optimization.
Aside from being faster, this also reduces the number of npm dependencies to install, some of which haven't been maintained very much over the last few years.