Remove billing.md and redirect to pricing-billing

- Delete billing.md (consolidated into pricing-billing.md)
- Add redirect entry in .openpublishing.redirection.container-apps.json
- Remove billing.md entry from toc.yml

Co-authored-by: Copilot <[email protected]>

Author: craigshoemaker

articles/sre-agent/.openpublishing.redirection.container-apps.json

@@ -79,6 +79,11 @@
             "source_path_from_root": "/articles/sre-agent/incident-management.md",
             "redirect_url": "/azure/sre-agent/incident-platforms",
             "redirect_document_id": false
+        },
+        {
+            "source_path_from_root": "/articles/sre-agent/billing.md",
+            "redirect_url": "/azure/sre-agent/pricing-billing",
+            "redirect_document_id": false
         }
     ]
 }

articles/sre-agent/billing.md

@@ -218,8 +218,6 @@ items:
         href: pricing-billing.md
       - name: Anthropic subprocessor
         href: anthropic-sub-processor.md
-      - name: Billing
-        href: billing.md
       - name: Frequently asked questions
         items:
           - name: General