[ImgBot] Optimize images

*Total -- 130.17kb -> 104.39kb (19.81%)

/blog-1/assets/i2.png -- 28.25kb -> 22.40kb (20.73%)
/blog-1/assets/i1.png -- 50.26kb -> 40.03kb (20.36%)
/blog-1/assets/i3.png -- 51.66kb -> 41.96kb (18.77%)

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

Author: ImgBotApp