Cannot add slides for some recordings

[chiesax]

Raphael Das Gupta – Comprehensions: Origin, History, Use [slides / code] : in the old web site, the link points to a Jupyter notebook,

Matthieu Amiguet – Charming Snake: Python for Live Music [slides]: in the old web site, points to a web site. The content is not a file that can be uploaded.

[dbrgn]

Yep. Ideally we could add n additional link-description pairs, but I don't think Lektor supports that kind of model field (list of url/string tuples)...