add sub page for our regular hakken event
Co-authored-by: Benjamin Bädorf <hello@benjaminbaedorf.eu>
Reviewed-on: https://git.b12f.io/pub-solar/pub.solar/pulls/2
Co-authored-by: Benjamin Bädorf <b12f@noreply.example.org>
Co-committed-by: Benjamin Bädorf <b12f@noreply.example.org>