[ImgBot] Optimize images

*Total -- 129.51kb -> 97.81kb (24.48%)

/public/src/images/android-chrome-512x512.png -- 89.40kb -> 64.93kb (27.37%)
/public/src/images/android-chrome-192x192.png -- 19.54kb -> 15.58kb (20.25%)
/public/src/images/apple-touch-icon.png -- 17.90kb -> 14.77kb (17.45%)
/public/src/images/close.png -- 0.73kb -> 0.62kb (15.43%)
/public/src/images/chat_icon.png -- 0.58kb -> 0.55kb (4.73%)
/public/src/images/favicon-32x32.png -- 1.36kb -> 1.35kb (0.93%)

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

Author: ImgBotApp