[ImgBot] Optimize images

*Total -- 551.34kb -> 513.49kb (6.86%)

/Images/model.jpg -- 71.67kb -> 59.21kb (17.39%)
/Header.png -- 61.43kb -> 54.68kb (10.99%)
/Images/a.jpg -- 103.26kb -> 97.41kb (5.67%)
/Images/r.jpg -- 136.01kb -> 129.40kb (4.86%)
/Images/k.jpeg -- 118.29kb -> 113.12kb (4.37%)
/Images/s.jpeg -- 60.67kb -> 59.66kb (1.66%)

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

Author: ImgBotApp