Update gallery.yml

Author: PeterBetlem

gallery.yml

@@ -27,7 +27,7 @@
   image: https://unisvalbard.github.io/Geo-UAV/_static/geo_mod-01.png
   keywords: UAV-based data acquisition tutorial for the geosciences.
 - name: Svalbox Deposit
-  website: https://svalbox.github.io/C2Svalbox/
+  website: https://svalbox.github.io/c2svalbox/
   image: https://svalbox.github.io/c2svalbox/_static/logo.webp
   keywords: Contribute data to Svalbox.no