[ImgBot] Optimize images

*Total -- 811.86kb -> 676.95kb (16.62%)

/readme-assets/social-media-logo.png -- 47.83kb -> 26.04kb (45.56%)
/readme-assets/demo.gif -- 764.04kb -> 650.91kb (14.81%)

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

Author: ImgBotApp