[ImgBot] Optimize images

[imgbot[bot]]

Beep boop. Your images are optimized!

Your image file size has been reduced by 81% 🎉

Details

File	Before	After	Percent reduction
/images/clusters1.png	51.81kb	8.48kb	83.64%
/images/labels1.png	48.33kb	9.85kb	79.63%
/images/xlabels1.png	67.15kb	13.81kb	79.43%
/images/raw-render1.png	10.90kb	2.25kb	79.34%
Total :	178.19kb	34.39kb	80.70%

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