Fix menu

mkdocs.yml

@@ -20,7 +20,8 @@ pages:
     - Applying for Resources: get-started-with-it4innovations/applying-for-resources.md
     - Obtaining Login Credentials: get-started-with-it4innovations/obtaining-login-credentials/obtaining-login-credentials.md
     - Certificates FAQ: get-started-with-it4innovations/obtaining-login-credentials/certificates-faq.md
-    - Accessing the Clusters: get-started-with-it4innovations/accessing-the-clusters/introduction.md
+    - Accessing the Clusters:
+      - Accessing the Clusters: get-started-with-it4innovations/accessing-the-clusters/introduction.md
       - SSH Keys: get-started-with-it4innovations/accessing-the-clusters/shell-access-and-data-transfer/ssh-keys.md
       - PuTTY: get-started-with-it4innovations/accessing-the-clusters/shell-access-and-data-transfer/putty.md
       - X Window System: get-started-with-it4innovations/accessing-the-clusters/graphical-user-interface/x-window-system.md