[ImgBot] Optimize images

*Total -- 1,140.89kb -> 795.49kb (30.27%)

/public/paper.png -- 337.28kb -> 142.14kb (57.86%)
/public/poster.png -- 329.00kb -> 219.89kb (33.16%)
/public/viz.png -- 305.28kb -> 272.31kb (10.8%)
/public/people/ruslan.jpeg -- 169.33kb -> 161.14kb (4.83%)

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

Author: ImgBotApp