remove dereferrer

docs/sponsoring.md

@@ -19,5 +19,5 @@ This is a list of companies providing (network) hardware and connectivity servic
 ## World
 |Company|Sponsoring|
 |---|---|
-|<a href="https://rc3.world/2021/dereferrer/https://www.hetzner.com" target="_blank"><img src="img/logos/Hetzner_Logo.png" alt="Hetzner Online GmbH" rel="noreferrer" width="150" height="45"/></a>|Cloud Nodes for the online map|
+|<a href="https://www.hetzner.com" target="_blank"><img src="img/logos/Hetzner_Logo.png" alt="Hetzner Online GmbH" rel="noreferrer" width="150" height="45"/></a>|Cloud Nodes for the online map|