[ImgBot] Optimize images

*Total -- 233.51kb -> 197.57kb (15.39%)

/.wordpress-org/banner-1544x500.jpg -- 163.21kb -> 137.21kb (15.92%)
/.wordpress-org/banner-772x250.jpg -- 70.30kb -> 60.36kb (14.15%)

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

Author: ImgBotApp