[ImgBot] Optimize images

*Total -- 16,649.87kb -> 12,862.46kb (22.75%)

/static/art-images/12.png -- 208.50kb -> 68.82kb (66.99%)
/static/art-images/17.png -- 165.47kb -> 56.67kb (65.75%)
/static/art-images/15.png -- 756.05kb -> 262.34kb (65.3%)
/static/art-images/13.png -- 54.82kb -> 22.92kb (58.18%)
/static/art-images/7.png -- 1,656.14kb -> 1,085.53kb (34.45%)
/static/art-images/10.png -- 645.73kb -> 437.71kb (32.22%)
/static/art-images/16.png -- 348.27kb -> 245.27kb (29.57%)
/static/art-images/2.png -- 1,172.00kb -> 828.99kb (29.27%)
/static/art-images/18.png -- 47.18kb -> 33.83kb (28.31%)
/static/art-images/3.png -- 617.48kb -> 474.92kb (23.09%)
/static/art-images/8.png -- 1,342.09kb -> 1,064.13kb (20.71%)
/static/art-images/4.png -- 1,905.37kb -> 1,525.10kb (19.96%)
/static/art-images/0.png -- 2,865.76kb -> 2,319.53kb (19.06%)
/static/favicon_32x32.png -- 1.90kb -> 1.61kb (15.52%)
/static/art-images/14.png -- 115.63kb -> 98.61kb (14.72%)
/static/art-images/5.png -- 1,224.49kb -> 1,051.41kb (14.13%)
/static/art-images/6.png -- 1,493.19kb -> 1,376.09kb (7.84%)
/static/art-images/1.png -- 985.38kb -> 916.80kb (6.96%)
/static/art-images/9.png -- 676.92kb -> 630.46kb (6.86%)
/static/img/bottom_icon.png -- 14.43kb -> 13.47kb (6.68%)
/static/img/background.jpg -- 353.07kb -> 348.24kb (1.37%)

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

Author: ImgBotApp