[ImgBot] Optimize images

*Total -- 95.11kb -> 81.75kb (14.05%)

/SP20/CV/CNN FASHION.png -- 20.39kb -> 17.09kb (16.21%)
/SP20/CV/Bigger CNN MNIST.png -- 17.15kb -> 14.78kb (13.84%)
/SP20/CV/Bigger CNN FASHION.png -- 19.87kb -> 17.18kb (13.56%)
/SP20/CV/Transfer FASHION.png -- 19.49kb -> 16.86kb (13.48%)
/SP20/CV/CNN MNIST.png -- 17.51kb -> 15.16kb (13.41%)
/website/public/static/github.svg -- 0.70kb -> 0.69kb (1.68%)

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