[ImgBot] Optimize images

*Total -- 73.31kb -> 58.59kb (20.07%)

/assets/image/logo.png -- 8.12kb -> 3.38kb (58.37%)
/document/img/WX20230312-193408.jpg -- 22.59kb -> 18.01kb (20.26%)
/document/img/WX20230312-193423.jpg -- 42.59kb -> 37.20kb (12.67%)

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

Author: ImgBotApp