[ImgBot] Optimize images

*Total -- 320.05kb -> 261.70kb (18.23%)

/assets/capture-progress.png -- 20.35kb -> 14.39kb (29.27%)
/assets/capture-in-progress.png -- 123.66kb -> 99.96kb (19.17%)
/assets/capture-complete.png -- 119.95kb -> 97.36kb (18.83%)
/assets/deep-learning.png -- 12.96kb -> 10.91kb (15.84%)
/assets/capture-graphs.png -- 43.13kb -> 39.08kb (9.4%)

Signed-off-by: ImgBotApp <[email protected]>

Author: ImgBotApp