[ImgBot] Optimize images

*Total -- 9,514.88kb -> 8,596.91kb (9.65%)

/src/imgs/semantic-kitti.png -- 908.78kb -> 531.82kb (41.48%)
/src/imgs/leaderboard-06-10-2023.png -- 256.81kb -> 156.96kb (38.88%)
/src/assert/maiweiai-qrcode.jpeg -- 118.57kb -> 92.54kb (21.95%)
/src/assert/charmve-wechat-qrcode.jpeg -- 129.69kb -> 101.62kb (21.64%)
/src/imgs/screenshot-20230822-002339.png -- 443.51kb -> 391.11kb (11.82%)
/src/imgs/mask.jpg -- 1,127.78kb -> 1,018.76kb (9.67%)
/src/imgs/occupanc_1.gif -- 6,503.33kb -> 6,277.98kb (3.47%)
/src/assert/maiwei_ai.png -- 26.40kb -> 26.12kb (1.06%)

Signed-off-by: ImgBotApp <[email protected]>

Author: ImgBotApp