Add secretless accounts

[friedger]

As a user, I don't know how to keep my nsec safely. Passkeys can help to onboard more users and to keep my nsec's hidden from me.

[friedger]

Work done: https://gitworkshop.dev/npub1hlw2enn647n0dc04l4tydv44n4s7z83f9vhz6dpe4qzfwq39jp8swu9ecz/relay.ngit.dev/hypergolic