[ImgBot] Optimize images

*Total -- 204.63kb -> 165.85kb (18.95%)

/Creational_Pattern/Singleton/crs/img.png -- 156.49kb -> 117.94kb (24.63%)
/dist/github-contribution-grid-snake.svg -- 48.14kb -> 47.91kb (0.48%)

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

Author: ImgBotApp