Closes #2641: Restored link to NetBox shell documentation

mkdocs.yml

@@ -38,6 +38,7 @@ pages:
         - Change Logging: 'additional-features/change-logging.md'
     - Administration:
         - Replicating NetBox: 'administration/replicating-netbox.md'
+        - NetBox Shell: 'administration/netbox-shell.md'
     - API:
         - Overview: 'api/overview.md'
         - Authentication: 'api/authentication.md'