[ImgBot] Optimize images

*Total -- 531.33kb -> 507.91kb (4.41%)

/static/images/logo.svg -- 7.12kb -> 6.54kb (8.1%)
/static/images/banner.jpeg -- 519.07kb -> 496.41kb (4.37%)
/static/images/logo.png -- 4.19kb -> 4.02kb (4.01%)
/static/images/calendar.svg -- 0.96kb -> 0.94kb (1.84%)

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

Author: ImgBotApp