[ImgBot] Optimize images

[imgbot[bot]]

Beep boop. Your images are optimized!

Your image file size has been reduced by 22% 🎉

Details

File	Before	After	Percent reduction
/assets/images/bg.png	272.49kb	158.61kb	41.79%
/assets/images/main_page_bg.png	55.96kb	40.86kb	26.99%
/assets/images/book-2.png	19.34kb	18.38kb	4.96%
/assets/images/book-1.png	33.13kb	31.54kb	4.80%
/assets/images/Bitmap.png	238.61kb	228.77kb	4.12%
/assets/images/book-3.png	24.42kb	23.54kb	3.63%
Total :	643.95kb	501.69kb	22.09%

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