Improves the developer experience (DX) around local development for brand packages to be able to serve their built CSS files as if they were hosted on a CDN for use in the recently updated Paragon documentation website theme selector that allows users to create custom themes with external CSS URLs.
Brand packages may now run `paragon serve-theme-css --theme-name "Custom Theme Name"` to generate a Paragon documentation website URL with the local CSS files applied.
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Co-authored-by: Adam Stankiewicz <agstanki@gmail.com>