[ImgBot] Optimize images

*Total -- 80.91kb -> 62.05kb (23.31%)

/src/assets/images/thumbnail.png -- 19.29kb -> 8.53kb (55.77%)
/src/assets/images/devsonket-icon.png -- 11.69kb -> 6.14kb (47.48%)
/src/assets/images/lost.svg -- 13.03kb -> 12.17kb (6.56%)
/static/static/thumbnail/thumbnail.jpg -- 36.89kb -> 35.20kb (4.58%)

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

Author: ImgBotApp