[ImgBot] Optimize images

*Total -- 211.36kb -> 181.54kb (14.11%)

/screenshot.png -- 71.31kb -> 47.36kb (33.58%)
/images/installation_1.jpeg -- 42.25kb -> 40.41kb (4.35%)
/images/installation_2.jpeg -- 97.80kb -> 93.77kb (4.12%)

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

Author: ImgBotApp