[ImgBot] Optimize images

[imgbot[bot]]

Beep boop. Your images are optimized!

Your image file size has been reduced by 45% 🎉

Details

File	Before	After	Percent reduction
/public/img/beian.png	18.80kb	1.51kb	91.95%
/public/img/water_mark.png	4.92kb	3.60kb	26.80%
/public/img/user_avatar.png	29.47kb	23.88kb	18.97%
Total :	53.19kb	28.99kb	45.49%

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