On your website post a nostr link to your npub. Maybe combined with njump. i.e. Https://njump.me/npub123etc

You could use a nostr logo by nostr:npub18nagz6a53yh6d05e8trj487dhvyfhh4qchvsz87jqng4g4zl5tvs825evl 

https://github.com/mbarulli/nostr-logo

cc nostr:npub180cvv07tjdrrgpa0j7j7tmnyl2yr6yr7l8j4s3evf6u64th6gkwsyjh6w6