[ImgBot] Optimize images (#696)
*Total -- 481.49kb -> 448.80kb (6.79%)
/content/zh-cn/docs/psyco/liaoning/zhang-liang/proof.jpeg -- 309.90kb -> 286.69kb (7.49%)
/content/zh-cn/docs/psyco/liaoning/zhang-liang/doctor.jpg -- 55.92kb -> 52.43kb (6.24%)
/content/zh-cn/docs/psyco/beijing/tang-hongyu/proof.jpg -- 74.73kb -> 70.35kb (5.86%)
/content/zh-cn/docs/psyco/beijing/tang-hongyu/doctor.jpg -- 40.95kb -> 39.34kb (3.93%)
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