[ImgBot] Optimize images

[imgbot[bot]]

Beep boop. Your images are optimized!

Your image file size has been reduced by 99% 🎉

Details

File	Before	After	Percent reduction
/client/images/share/twitter.png	420.44kb	1.74kb	99.59%
/client/images/share/weibo.png	421.92kb	3.24kb	99.23%
/client/images/header-logo.png	6.67kb	4.12kb	38.27%
Total :	849.03kb	9.10kb	98.93%

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