[ImgBot] Optimize images

*Total -- 1,052.23kb -> 1,025.64kb (2.53%)

/img/avatar_kh/annabelle_a.jpg -- 165.27kb -> 159.27kb (3.63%)
/img/avatar_kh/SAS_a.jpg -- 165.59kb -> 160.05kb (3.35%)
/img/avatar_kh/xinghai_a.jpg -- 161.41kb -> 156.24kb (3.2%)
/img/avatar_kh/sophia_a.jpg -- 158.80kb -> 154.16kb (2.92%)
/img/avatar_kh/howling_a.jpg -- 144.39kb -> 140.46kb (2.72%)
/img/avatar_kh/annabelle_fk.jpg -- 26.43kb -> 26.24kb (0.69%)
/img/avatar_kh/sophia_fk.jpg -- 23.59kb -> 23.45kb (0.61%)
/img/avatar_kh/howling.jpg -- 24.91kb -> 24.76kb (0.6%)
/img/avatar_kh/xinghai_fk.jpg -- 24.30kb -> 24.16kb (0.59%)
/img/avatar_kh/SAS.jpg -- 25.83kb -> 25.69kb (0.55%)
/img/avatar_kh/howling_fk.jpg -- 29.46kb -> 29.30kb (0.53%)
/img/avatar_kh/sophia.jpg -- 23.58kb -> 23.48kb (0.42%)
/img/avatar_kh/annabelle.jpg -- 29.74kb -> 29.62kb (0.4%)
/img/avatar_kh/SAS_fk.jpg -- 22.82kb -> 22.73kb (0.4%)
/img/avatar_kh/xinghai.jpg -- 26.10kb -> 26.03kb (0.26%)
Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>