Add link rel="alternate" and hreflang to avoid localized duplicated results in organic search

[theletterf]

I've noticed this issue when searching for OTel.io docs. Canonical (en) docs appear together with their localized versions:

Google's recommendation is to use <link rel="alternate" hreflang="code">, but Docsy doesn't seem to handle that. I'm not entirely sure it'd be the solution, though.

Should we investigate this?

[Shriya-23]

Hello, @theletterf , @chalin ,I’d like to assist with this issue by enhancing the documentation with instructions and examples for usage in Docsy. Please let me know if this would be useful, and I’ll get started. Appreciate your guidance!