[ImgBot] Optimize images

*Total -- 774.29kb -> 758.49kb (2.04%)

/docs/gitbook/images/apple-touch-icon-precomposed-152.png -- 4.70kb -> 1.82kb (61.3%)
/docs/official/gitbook/images/apple-touch-icon-precomposed-152.png -- 4.70kb -> 1.82kb (61.3%)
/docs/gitbook/fonts/fontawesome/fontawesome-webfont.svg -- 382.44kb -> 377.43kb (1.31%)
/docs/official/gitbook/fonts/fontawesome/fontawesome-webfont.svg -- 382.44kb -> 377.43kb (1.31%)

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