Update mkdocs.yml

Author: enzosav

mkdocs.yml

@@ -37,7 +37,6 @@ nav:
           - Service Description: 'dashboards/data-controller-dashboard/service-description.md'
   - 'CaPe APIs':
       - 'API Documentation' : 'api/index.md'
-      - 'API walkthrough': 'api/usage.md'
   - 'Use Cases & Demo':
       - 'Within Service': 'demo/within-service.md'
       - 'Sharing between Services': 'demo/sharing-services.md'