[ImgBot] Optimize images

*Total -- 729.87kb -> 522.54kb (28.41%)

/assets/logos/shop-hacker.png -- 19.08kb -> 2.55kb (86.63%)
/assets/logos/devcamp.png -- 21.49kb -> 4.38kb (79.61%)
/assets/logos/edutechional.png -- 23.03kb -> 5.41kb (76.52%)
/assets/images/jumping-bug.gif -- 399.40kb -> 248.08kb (37.89%)
/assets/logos/dropbox.png -- 3.50kb -> 2.57kb (26.63%)
/assets/logos/calculator.png -- 15.59kb -> 12.04kb (22.8%)
/assets/images/portfolio2.jpg -- 247.79kb -> 247.52kb (0.11%)

Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>

Author: ImgBotApp