[ImgBot] Optimize images

*Total -- 1,193.61kb -> 796.59kb (33.26%)

/src/bilibili.com/img/firefox_2023-06-19_00-38-06.png -- 215.22kb -> 137.52kb (36.1%)
/src/bilibili.com/img/chrome_2023-06-16_01-11-42.png -- 384.42kb -> 248.19kb (35.44%)
/src/bilibili.com/img/chrome_2023-06-19_00-56-11.png -- 224.27kb -> 150.22kb (33.02%)
/src/bilibili.com/img/chrome_2023-05-08_23-14-07.png -- 369.71kb -> 260.66kb (29.5%)

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

Author: ImgBotApp