Update _index.md

Updated link to course catalogue on UiOs website

Author: CSGeer

content/workshops/_index.md

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 # Workshops
 
-We organize workshops multiple times a year. The best place to learn more about our workshops or register for one of them is [the University of Oslo Library's Carpentry course catalogue]([https://www.ub.uio.no/english/courses-events/courses/other/Carpentry/](https://www.ub.uio.no/english/courses-events/courses/carpentry/)) or [sign up UiO@Carpentry mailing list](https://sympa.uio.no/swcarpentry.uio.no/subscribe/announcements).
+We organize workshops multiple times a year. The best place to learn more about our workshops or register for one of them is [the University of Oslo Library's Carpentry course catalogue](https://www.ub.uio.no/english/courses-events/courses/carpentry/) or [sign up UiO@Carpentry mailing list](https://sympa.uio.no/swcarpentry.uio.no/subscribe/announcements).
 Inbetween workshops we meet for study groups. To learn more about the study group go [here]({{< relref "/study_group" >}}).
 
 ## Upcoming Workshops