[ImgBot] Optimize images

*Total -- 1,372.37kb -> 1,209.85kb (11.84%)

/img/python-logo.png -- 81.61kb -> 8.41kb (89.69%)
/img/logo_Google_FullColor.png -- 10.35kb -> 5.58kb (46.1%)
/img/speakers-2024/tracy-teal.jpg -- 955.19kb -> 878.37kb (8.04%)
/img/speakers-2024/mago-torres.jpeg -- 15.38kb -> 14.91kb (3.09%)
/img/speakers-2024/alejandra-padilla.jpg -- 301.95kb -> 294.70kb (2.4%)
/img/Omidyar-logo.png -- 7.88kb -> 7.88kb (0.05%)

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

Author: ImgBotApp