feat: add youtube and related links in the recipe description

This feature is requested by some users. 

[This user suggested one-line caption that said "more information"etc. for external links](https://www.producthunt.com/posts/webrew?comment=4363076)
[This user suggested youtube video to follow along with the recipe](https://www.producthunt.com/posts/webrew?comment=4362096)
