[ImgBot] Optimize images

*Total -- 300.99kb -> 265.54kb (11.78%)

/client/src/Assets/images/discord.png -- 11.78kb -> 9.30kb (21.01%)
/client/src/Assets/images/addAction.png -- 168.13kb -> 144.84kb (13.85%)
/client/src/Assets/images/addSecret.png -- 78.90kb -> 71.86kb (8.93%)
/client/src/Assets/images/logo.png -- 21.09kb -> 19.77kb (6.25%)
/client/public/logo.png -- 21.09kb -> 19.77kb (6.25%)

Signed-off-by: ImgBotApp <[email protected]>

Author: ImgBotApp