[ImgBot] Optimize images

*Total -- 221.83kb -> 126.15kb (43.13%)

/app/assets/shapes.png -- 49.95kb -> 18.73kb (62.49%)
/app/assets/triangle.png -- 65.64kb -> 33.97kb (48.26%)
/app/assets/discord.png -- 67.52kb -> 40.41kb (40.15%)
/app/assets/img-home.png -- 18.90kb -> 14.89kb (21.23%)
/app/assets/logo-favicon-color.svg -- 3.56kb -> 3.11kb (12.67%)
/app/assets/logo.svg -- 16.27kb -> 15.05kb (7.5%)

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

Author: ImgBotApp