Add color previews in markdown (#21474)
* Resolves #3047
Every time a color code will be in \`backticks`, a cute little color
preview will pop up
[Inspiration](https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#supported-color-models)
#### Before
![image](https://user-images.githubusercontent.com/20454870/196631524-298afbbf-d2c8-4018-92a5-0393a693d850.png)
#### After
![image](https://user-images.githubusercontent.com/20454870/196631397-36c561e4-08f5-465a-a36e-76084e30b08a.png)
Signed-off-by: Yarden Shoham <hrsi88@gmail.com>
Co-authored-by: KN4CK3R <admin@oldschoolhack.me>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>