Our new Lexical -> JSX converter is great, but right now it can only be
used in environments that support CSS importing / bundling.
It was only that way because of a single import file which can be
removed and inlined, therefore, improving the versatility of the JSX
converter and making it more usable in a wider variety of runtimes.
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Co-authored-by: Germán Jabloñski <43938777+GermanJablo@users.noreply.github.com>