Revert "Merge branch 'patch-1' into 'master'"

This reverts commit 8b2ee880, reversing
changes made to 74475a8f.

en/gitlab.md

@@ -15,7 +15,7 @@ To get an understanding of card10 (cardio) checkout:
 
 - Our wiki [Wiki](https://card10.badge.events.ccc.de)
 - Explore our [GitLab Server](https://git.card10.badge.events.ccc.de/explore/groups).
-   - Also checkout our public repos at [`/card10`](https://git.card10.badge.events.ccc.de/card10/), including source for the wiki.
+   - Also checkout our public repos at [`/card10`](https://git.card10.badge.events.ccc.de/open/), including source for the wiki.
 
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