[ImgBot] Optimize images

*Total -- 220.50kb -> 209.83kb (4.84%)

/Dominant Color Extraction/images/output.jpg -- 115.68kb -> 106.60kb (7.85%)
/WhatsApp Image 2021-01-19 at 17.51.43.jpeg -- 52.41kb -> 51.61kb (1.52%)
/Hangman Game/Output.jpeg -- 52.41kb -> 51.61kb (1.52%)

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