[ImgBot] Optimize images

*Total -- 64.42kb -> 49.37kb (23.37%)

/public/apple-touch-icon.png -- 9.31kb -> 6.77kb (27.24%)
/public/android-chrome-192x192.png -- 10.33kb -> 7.60kb (26.43%)
/public/android-chrome-512x512.png -- 44.78kb -> 34.99kb (21.85%)

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

Author: ImgBotApp