[ImgBot] Optimize images

*Total -- 1,045.40kb -> 878.99kb (15.92%)

/images/Introduccion-ML.png -- 461.40kb -> 303.65kb (34.19%)
/assets/fonts/fontawesome-webfont.svg -- 433.96kb -> 425.36kb (1.98%)
/images/banner.jpg -- 150.03kb -> 149.98kb (0.03%)

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Author: ImgBotApp