[ImgBot] Optimize images

*Total -- 2,057.79kb -> 638.94kb (68.95%)

/public/demo.png -- 780.42kb -> 130.97kb (83.22%)
/public/demo2.png -- 1,277.14kb -> 507.75kb (60.24%)
/public/logo.svg -- 0.23kb -> 0.23kb (2.93%)

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

Author: ImgBotApp