Add denbi as a supporter for NUBRI event

In order to put it on De.NBI website

Author: Sch-Da

content/events/2026-02-03-Nubri/index.md

@@ -7,7 +7,7 @@ location:
 tags: [NUBRI]
 organizers:
   - galaxyfreiburg
-supporters: [de.KCD]
+supporters: [de.KCD, denbi]
 subsites: [all, eu]
 ---