[ImgBot] Optimize images

*Total -- 251.46kb -> 151.89kb (39.6%)

/public/apple-touch-icon.png -- 25.29kb -> 15.12kb (40.21%)
/public/android-chrome-192x192.png -- 27.80kb -> 16.62kb (40.2%)
/public/android-chrome-512x512.png -- 196.78kb -> 118.70kb (39.68%)
/public/favicon-32x32.png -- 1.60kb -> 1.46kb (8.91%)

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

Author: ImgBotApp