Update mkdocs.yml

mkdocs.yml

@@ -61,12 +61,14 @@ nav:
       - Capacity Computing: general/capacity-computing.md
       - Migrating from SLURM: general/slurmtopbs.md
     - Connect to the Clusters:
-      - SSH Key Management: general/accessing-the-clusters/shell-access-and-data-transfer/ssh-key-management.md
-      - OpenSSH Keys (UNIX): general/accessing-the-clusters/shell-access-and-data-transfer/ssh-keys.md
-      - PuTTY (Windows): general/accessing-the-clusters/shell-access-and-data-transfer/putty.md
-      - X Window System: general/accessing-the-clusters/graphical-user-interface/x-window-system.md
-      - Xorg: general/accessing-the-clusters/graphical-user-interface/xorg.md
-      - VNC: general/accessing-the-clusters/graphical-user-interface/vnc.md
+      - SSH: 
+        - SSH Key Management: general/accessing-the-clusters/shell-access-and-data-transfer/ssh-key-management.md
+        - OpenSSH Keys (UNIX): general/accessing-the-clusters/shell-access-and-data-transfer/ssh-keys.md
+        - PuTTY (Windows): general/accessing-the-clusters/shell-access-and-data-transfer/putty.md
+      - GUI:
+        - X Window System: general/accessing-the-clusters/graphical-user-interface/x-window-system.md
+        - Xorg: general/accessing-the-clusters/graphical-user-interface/xorg.md
+        - VNC: general/accessing-the-clusters/graphical-user-interface/vnc.md
       - VPN Access: general/accessing-the-clusters/vpn-access.md
     - Satisfaction and Feedback: general/feedback.md  
     - PRACE User Support: prace.md