[ImgBot] Optimize images

*Total -- 811.76kb -> 722.82kb (10.96%)

/public/uploads/og_images/testuser_og.png -- 234.76kb -> 205.88kb (12.3%)
/public/uploads/og_images/dean28_og.png -- 235.75kb -> 206.75kb (12.3%)
/public/uploads/og_images/Deano123_og.png -- 237.11kb -> 208.04kb (12.26%)
/public/banners/default_banner.jpg -- 104.14kb -> 102.15kb (1.91%)

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

Author: ImgBotApp