[ImgBot] Optimize images

*Total -- 1,354.65kb -> 1,079.29kb (20.33%)

/thumbnail.png -- 1,354.04kb -> 1,078.68kb (20.34%)
/public/vercel.svg -- 0.61kb -> 0.61kb (0.16%)

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

Author: ImgBotApp