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Is your feature request related to a problem? Please describe.

Nextcloud users have a profile page.

Describe the solution you'd like

Write the profile URL to the SAB contact if the profile is enabled.
Don't write the URL otherwise.
Optional: write a type or similar attribute that allows us to distinguish any URLs from Nextcloud profile URLs for nextcloud/contacts#3365

Describe alternatives you've considered

N/a

Additional context

• URL property spec: https://www.rfc-editor.org/rfc/rfc6350.html#section-6.7.8