End card

Every video ends with a 4 s card: the logo, "Created with narratty", a link to these docs and a QR code of the link.

To leave it out:

Scope	Setting
One build	narratty build demo.narratty.yaml --no-end-card
One spec	end_card: false
All your builds	[end_card] enabled = false in ~/.config/narratty/config.toml

end_card.duration_ms sets the length, end_card.qr: false drops the QR code. See end_card.