[ImgBot] Optimize images

*Total -- 3,459.20kb -> 3,225.98kb (6.74%)

/assets/images/logo1.png -- 56.06kb -> 26.81kb (52.18%)
/assets/images/logo.png -- 6.66kb -> 4.24kb (36.27%)
/assets/images/screenshot.jpg -- 426.19kb -> 324.09kb (23.96%)
/assets/images/logo2.png -- 13.16kb -> 11.01kb (16.28%)
/assets/images/git-tutorials.png -- 21.33kb -> 18.00kb (15.65%)
/assets/images/profile-pic-plain-blue.png -- 180.64kb -> 157.10kb (13.03%)
/assets/fonts/casper-icons.svg -- 5.70kb -> 5.44kb (4.57%)
/assets/images/9.jpg -- 345.12kb -> 333.71kb (3.31%)
/assets/images/11.jpg -- 171.60kb -> 165.97kb (3.28%)
/assets/images/16.jpg -- 282.01kb -> 272.84kb (3.25%)
/assets/images/15.jpg -- 214.05kb -> 207.17kb (3.21%)
/assets/images/2bis.jpg -- 288.39kb -> 279.79kb (2.98%)
/assets/images/12.jpg -- 286.73kb -> 278.50kb (2.87%)
/assets/images/2.jpg -- 160.34kb -> 156.46kb (2.42%)
/assets/images/1.jpg -- 237.13kb -> 232.03kb (2.15%)
/assets/images/7.jpg -- 194.41kb -> 190.39kb (2.07%)
/assets/images/3.jpg -- 244.30kb -> 240.30kb (1.64%)
/assets/images/5.jpg -- 178.08kb -> 175.37kb (1.52%)
/assets/images/17.jpg -- 147.28kb -> 146.76kb (0.35%)

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

Author: ImgBotApp