chore(root): Crush images with imageOptim for lossless image compression

[imbrianj]

ImageOptim uses pngcrush, MozJPEG, pngquant, svgo, and other image optimization tools and saves the one with the greatest benefit. This is a lossless change: it removes alpha channels, exif metadata, etc.

I had noticed many assets within react-email were getting pretty significant benefit from crushing and wanted to share upstream. There should be no visual difference with these changes.

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Summary by cubic

Compresses all static images in the demo emails with ImageOptim. The lossless compression removes alpha channels, EXIF metadata, and other redundant data with no visual difference.

^{Written for commit be04778. Summary will update on new commits.}

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