[ImgBot] Optimize images

*Total -- 539.42kb -> 397.57kb (26.3%)

/Architecture Diagram_white.png -- 161.63kb -> 109.63kb (32.17%)
/frontend/flask_frontend/static/Round-1 result.png -- 230.24kb -> 174.27kb (24.31%)
/frontend/flask_frontend/static/Home.png -- 147.55kb -> 113.67kb (22.96%)

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

Author: ImgBotApp