[ImgBot] Optimize images
*Total -- 255.44kb -> 204.86kb (19.8%)
/docs/examples/images/Figure_7.png -- 80.89kb -> 64.43kb (20.35%)
/docs/examples/images/Figure_6.png -- 172.36kb -> 138.25kb (19.79%)
/docs/images/logo.svg -- 2.19kb -> 2.18kb (0.04%)
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