[ImgBot] Optimize images

*Total -- 1,698.17kb -> 1,657.45kb (2.4%)

/img/app.svg -- 2.37kb -> 1.12kb (52.92%)
/img/stop-button.svg -- 0.92kb -> 0.50kb (45.6%)
/img/play-button.svg -- 1.10kb -> 0.75kb (31.41%)
/css/fonts/open-iconic.svg -- 53.50kb -> 50.63kb (5.37%)
/webfonts/fa-regular-400.svg -- 136.55kb -> 132.62kb (2.88%)
/webfonts/fa-solid-900.svg -- 775.01kb -> 753.20kb (2.81%)
/webfonts/fa-brands-400.svg -- 728.72kb -> 718.63kb (1.39%)

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

Author: ImgBotApp