[ImgBot] Optimize images

[imgbot[bot]]

Beep boop. Your images are optimized!

Your image file size has been reduced by 5% 🎉

Details

File	Before	After	Percent reduction
/assets/images/banner.png	406.10kb	383.80kb	5.49%
/assets/images/plushpromo.png	472.86kb	453.96kb	4.00%
Total :	878.96kb	837.76kb	4.69%

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