[ImgBot] Optimize images

*Total -- 204.84kb -> 166.06kb (18.93%)

/Creational_Pattern/Singleton/crs/img.png -- 156.49kb -> 117.94kb (24.63%)
/dist/github-contribution-grid-snake.svg -- 48.35kb -> 48.11kb (0.49%)

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

Author: ImgBotApp