[ImgBot] Optimize images

*Total -- 14,902.74kb -> 14,565.81kb (2.26%)

/media/default.jpg -- 860.76kb -> 707.13kb (17.85%)
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/.env/lib/python3.6/site-packages/django/contrib/admin/static/admin/img/calendar-icons.svg -- 1.07kb -> 1.00kb (6.4%)
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