This is now part of NIP-21: https://github.com/nostr-protocol/nips/blob/master/21.md#linking-html-pages-to-nostr-entities
So if you render Nostr content somewhere on the Web, or you just want to link your Nostr identity on your personal website in a machine-readable way, then consider adding the respective link tags to your HTML markup.
(Personally, I still prefer adding 'type="application/json+nostr"' to the elements for maximum interoperability, but it's optional.)
