[ImgBot] Optimize images

*Total -- 446.45kb -> 353.95kb (20.72%)

/ReArrange_PDF/img/3.png -- 18.56kb -> 6.66kb (64.12%)
/ReArrange_PDF/img/4.png -- 10.13kb -> 6.48kb (35.98%)
/ReArrange_PDF/img/6.png -- 35.04kb -> 22.75kb (35.07%)
/ReArrange_PDF/img/5.png -- 36.72kb -> 24.48kb (33.33%)
/ReArrange_PDF/img/1.png -- 25.51kb -> 17.65kb (30.79%)
/ReArrange_PDF/img/2.png -- 31.82kb -> 23.35kb (26.62%)
/Document-Word-Detection/output.jpg -- 288.67kb -> 252.57kb (12.51%)

Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>

Author: ImgBotApp