[ImgBot] Optimize images

[imgbot[bot]]

Beep boop. Your images are optimized!

Your image file size has been reduced by 51% 🎉

Details

File	Before	After	Percent reduction
/img/to-top-hover.png	1.27kb	0.62kb	51.31%
/img/to-top.png	1.28kb	0.63kb	50.99%
Total :	2.55kb	1.25kb	51.15%

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