[ImgBot] Optimize images

*Total -- 478.43kb -> 405.70kb (15.2%)

/Reddit-scraping-and-flair-detection/comms per flair.png -- 140.14kb -> 115.74kb (17.41%)
/Reddit-scraping-and-flair-detection/score per flair.png -- 141.56kb -> 118.06kb (16.6%)
/Reddit-scraping-and-flair-detection/title.png -- 59.11kb -> 51.49kb (12.88%)
/Reddit-scraping-and-flair-detection/lenth of words in body.png -- 58.25kb -> 50.77kb (12.84%)
/Reddit-scraping-and-flair-detection/value.png -- 79.37kb -> 69.64kb (12.26%)

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