[ImgBot] Optimize images

*Total -- 145.75kb -> 123.51kb (15.26%)

/assets/Sun.png -- 13.21kb -> 7.40kb (43.97%)
/assets/Moon.png -- 126.64kb -> 110.21kb (12.97%)
/assets/blueQuote_light.svg -- 2.95kb -> 2.95kb (0.13%)
/assets/blueQuote_dark.svg -- 2.95kb -> 2.95kb (0.13%)

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

Author: ImgBotApp