[ImgBot] Optimize images

*Total -- 251.65kb -> 209.46kb (16.76%)

/assets/banner_raw.svg -- 11.86kb -> 8.44kb (28.79%)
/assets/banner.png -- 93.69kb -> 69.72kb (25.58%)
/assets/logo.svg -- 12.25kb -> 10.53kb (14%)
/assets/lychee.gif -- 97.28kb -> 85.84kb (11.76%)
/assets/banner.svg -- 35.98kb -> 34.35kb (4.54%)
/assets/maybe.svg -- 0.14kb -> 0.14kb (3.42%)
/assets/yes.svg -- 0.19kb -> 0.18kb (2.58%)
/assets/no.svg -- 0.26kb -> 0.25kb (1.88%)

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

Author: ImgBotApp