doc(managing): Remove managing disk usage page

Author: krancour

mkdocs.yml

@@ -29,7 +29,6 @@ pages:
   - Managing Workflow:
     - Configuring Load Balancers: managing-workflow/configuring-load-balancers.md
     - Configuring DNS: managing-workflow/configuring-dns.md
-    - Managing Disk Usage: managing-workflow/managing-disk-usage.md
     - Operational Tasks: managing-workflow/operational-tasks.md
     - Platform Logging: managing-workflow/platform-logging.md
     - Platform Monitoring: managing-workflow/platform-monitoring.md