Remove redirection

Author: spelluru

articles/event-grid/.openpublishing.redirection.event-grid.json

@@ -10,11 +10,6 @@
       "redirect_url": "/azure/event-grid/transport-layer-security-configure-minimum-version",
       "redirect_document_id": false
     },    
-    {
-      "source_path": "configure-network-security-perimeter.md",
-      "redirect_url": "/azure/event-grid/network-security",
-      "redirect_document_id": false
-    },    
     {
       "source_path": "webhook-event-delivery.md",
       "redirect_url": "/azure/event-grid/end-point-validation-cloud-events-schema",