Legacy React IdealImage lib

This is legacy code from an npm package we forked, then internalized

See also:

• https://github.com/slorber/docusaurus-react-ideal-image
• https://github.com/endiliey/react-ideal-image
• https://github.com/stereobooster/react-ideal-image

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TODO: we need to clean it up, remove what we don't need, and maintain it up to date