[ImgBot] Optimize images

*Total -- 310.58kb -> 293.33kb (5.56%)

/assets/images/icons/sites/quora/icon512.png -- 8.83kb -> 6.52kb (26.17%)
/assets/images/icons/sites/quora/icon128.png -- 10.16kb -> 8.62kb (15.2%)
/assets/images/icons/sites/quora/icon32.png -- 3.41kb -> 2.91kb (14.83%)
/assets/images/icons/sites/quora/icon48.png -- 4.67kb -> 4.04kb (13.55%)
/assets/images/icons/sites/quora/icon64.png -- 5.81kb -> 5.04kb (13.19%)
/assets/images/icons/sites/quora/icon256.png -- 19.16kb -> 16.79kb (12.32%)
/assets/images/icons/sites/quora/icon16.png -- 2.30kb -> 2.05kb (11.04%)
/block-quora-poe/assets/images/screenshots/demo.png -- 256.24kb -> 247.35kb (3.47%)

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

Author: ImgBotApp