[ImgBot] Optimize images

*Total -- 1,344.11kb -> 1,229.58kb (8.52%)

/images/pulse-thumbnail-vao.jpg -- 136.93kb -> 121.05kb (11.6%)
/images/banner-spotlight1.jpg -- 849.62kb -> 768.11kb (9.59%)
/images/pulse-thumbnail-spotlight1.jpg -- 169.95kb -> 154.36kb (9.17%)
/images/banner-vao.jpg -- 187.61kb -> 186.06kb (0.83%)

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

Author: ImgBotApp