Should we automatically add `rel="nofollow"` to external links?

[p-schlickmann]

Currently, when adding an external link in Lexxy, there's no easy way to control or modify the rel attribute on the generated <a> tag.

This means all external links are rendered as plain <a href="...">, which could unintentionally pass SEO value or enable backlink farming:

Maybe we could automatically add rel="nofollow" to every external link? Or make this configurable somehow?

Open to suggestions!