[ImgBot] Optimize images

*Total -- 212.21kb -> 131.37kb (38.09%)

/QR_Code_Generator/qr.png -- 7.87kb -> 1.09kb (86.15%)
/Broswer/b1.png -- 162.10kb -> 102.76kb (36.61%)
/Broswer/b2.png -- 42.24kb -> 27.52kb (34.84%)

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

Author: ImgBotApp