[ImgBot] Optimize images

*Total -- 906.46kb -> 734.25kb (19%)

/img/018.png -- 247.89kb -> 151.76kb (38.78%)
/img/011.png -- 0.95kb -> 0.72kb (24.2%)
/img/012.png -- 21.54kb -> 17.04kb (20.86%)
/img/017.png -- 202.86kb -> 165.68kb (18.33%)
/img/009.png -- 54.21kb -> 47.21kb (12.9%)
/img/014.png -- 38.82kb -> 33.86kb (12.77%)
/img/005.png -- 0.59kb -> 0.53kb (11.66%)
/img/007.png -- 86.93kb -> 77.75kb (10.56%)
/img/010.png -- 86.60kb -> 78.33kb (9.55%)
/img/003.png -- 0.57kb -> 0.52kb (8.22%)
/img/008.png -- 0.54kb -> 0.50kb (7.45%)
/img/016.png -- 65.62kb -> 61.90kb (5.67%)
/img/006.png -- 0.50kb -> 0.48kb (4.87%)
/img/013.png -- 0.50kb -> 0.47kb (4.72%)
/img/004.png -- 0.52kb -> 0.49kb (4.36%)
/img/015.png -- 44.86kb -> 44.38kb (1.06%)
/img/002.png -- 52.98kb -> 52.62kb (0.68%)

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

Author: ImgBotApp