[ImgBot] Optimize images

*Total -- 206.75kb -> 175.40kb (15.16%)

/src/assets/normn.png -- 204.90kb -> 173.71kb (15.22%)
/src/assets/code.svg -- 1.84kb -> 1.70kb (8%)

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

Author: ImgBotApp