[ImgBot] Optimize images

*Total -- 15,965.52kb -> 15,702.43kb (1.65%)

/public/main/RetroRemix/llama_balloon.png -- 33.56kb -> 25.50kb (24.01%)
/public/sunflare_blue.png -- 323.16kb -> 254.42kb (21.27%)
/public/sunflare-removebg.png -- 122.21kb -> 102.28kb (16.31%)
/public/splash.png -- 1,264.83kb -> 1,173.99kb (7.18%)
/public/login_button_hover.png -- 223.44kb -> 207.92kb (6.94%)
/public/login_button.png -- 245.37kb -> 229.42kb (6.5%)
/public/sponsor_button_hover.png -- 182.03kb -> 170.96kb (6.08%)
/public/sponsor_button.png -- 153.18kb -> 146.21kb (4.55%)
/public/background.png -- 10,269.28kb -> 10,246.71kb (0.22%)
/public/background-cropped.png -- 3,148.46kb -> 3,145.01kb (0.11%)

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

Author: ImgBotApp