Print QR code instead (or apart) of any external content

[ignaciogros]

This is specially interesting for printed contents:

Print a QR code instead of the URL or the external content itself.

See https://t.me/eXeLearning/36946, https://t.me/eXeLearning/36953 and Fran Melendo's solution: https://ipepcordoba.com/d/enlaces_a_qr/