[ImgBot] Optimize images

*Total -- 311.20kb -> 292.70kb (5.94%)

/diagram.svg -- 143.62kb -> 133.00kb (7.4%)
/public/assets/imgs/blog/gh-mobile.jpg -- 167.57kb -> 159.70kb (4.7%)

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

Author: ImgBotApp