[ImgBot] Optimize images

*Total -- 8,640.79kb -> 7,831.83kb (9.36%)

/images/island-eye-color.jpg -- 2,619.40kb -> 2,351.07kb (10.24%)
/docs/images/island-eye-color.jpg -- 2,619.40kb -> 2,351.07kb (10.24%)
/images/water-cup.jpg -- 1,700.99kb -> 1,564.85kb (8%)
/docs/images/water-cup.jpg -- 1,700.99kb -> 1,564.85kb (8%)

Author: ImgBotApp