[ImgBot] Optimize images

*Total -- 40.12kb -> 25.38kb (36.74%)

/dist/sample.png -- 15.40kb -> 8.16kb (47.02%)
/sample.png -- 15.40kb -> 8.16kb (47.02%)
/dist/icon.png -- 4.66kb -> 4.53kb (2.81%)
/icon.png -- 4.66kb -> 4.53kb (2.81%)

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

Author: ImgBotApp