[ImgBot] Optimize images
*Total -- 1,486.28kb -> 1,008.29kb (32.16%)
/docs/doc/images/example_2.png -- 739.85kb -> 497.60kb (32.74%)
/docs/doc/images/example_1.png -- 744.25kb -> 508.51kb (31.67%)
/docs/images/logo.svg -- 2.19kb -> 2.18kb (0.04%)
Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>
