[ImgBot] Optimize images

*Total -- 1,366.93kb -> 1,274.72kb (6.75%)

/.gitbook/assets/cover-new.jpg -- 899.89kb -> 823.68kb (8.47%)
/.gitbook/assets/Jammy-Jellyfish_WP_1920x1080.jpg -- 467.04kb -> 451.04kb (3.43%)

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

Author: ImgBotApp