Merge branch 'lang-master-patch-f5b3' into 'master'

Update link to buttons and header

See merge request !35

docs/presentations.md

@@ -32,10 +32,9 @@
 We publish the material of our workshops on this [google
 drive](https://drive.google.com/drive/folders/1nT0YpZfOZ9YxQ-qgsA16zZw5KJ0TnTgV).
 
-## IAM4NFDI Login Buttons
-You can download the NFDI Login Buttons for your service here:
-- Button [NFDI Login blue](images/NFDI_Login_blue.png)
-- Button [NFDI Login white](images/NFDI_Login_white.png)
+## Login Buttons
+You can download the NFDI Login Buttons for your service here: https://extfiles.dfn.de/index.php/s/EW2p8RepCyRmHZJ?
+
 
 
 {% include 'gitinfo.md' %}