update documentation link

templates/header.html

@@ -38,7 +38,7 @@
     {#- {%- else %}-#}
     {#- <li class="nav-item"><a id="{{prefix}}start-nav-item" class="nav-link text-decoration-none" href="{{ base_url }}login">Login</a></li>-#}
     <li class="nav-item"><a id="{{prefix}}status-nav-item" class="nav-link text-decoration-none" target="_blank" href="https://status.jsc.fz-juelich.de/">JSC Status</a></li>
-    <li class="nav-item"><a id="{{prefix}}docs-nav-item" class="nav-link text-decoration-none" target="_blank" href="https://docs.hub.nfdi-jupyter.de">Documentation</a></li>
+    <li class="nav-item"><a id="{{prefix}}docs-nav-item" class="nav-link text-decoration-none" target="_blank" href="https://nfdi-jupyter.de">Documentation</a></li>
     <li class="nav-item"><a id="{{prefix}}links-nav-item" class="nav-link text-decoration-none" href="{{ base_url }}links">More Links</a></li>
     {%- endif %}
   </div>