fix: address blocking review issues across skill articles

- Rename appinsights-instrumentation.md to app-insights-instrumentation.md
- Rename azure-aigateway.md to azure-ai-gateway.md
- Update TOC.yml references for renamed files
- Lowercase 'Hosted' in azure-hosted-copilot-sdk.md title
- Add 'Azure' before 'Data Explorer' in azure-kusto.md title
- Add intro paragraph between H1 and H2 in overview.md

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: diberry

articles/azure-skills/TOC.yml

@@ -8,9 +8,9 @@ items:
 - name: Skills reference
   items:
   - name: App Insights Instrumentation
-    href: skills/appinsights-instrumentation.md
+    href: skills/app-insights-instrumentation.md
   - name: Azure AI Gateway
-    href: skills/azure-aigateway.md
+    href: skills/azure-ai-gateway.md
   - name: Azure AI Services
     href: skills/azure-ai.md
   - name: Azure Cloud Migration

articles/azure-skills/overview.md

@@ -13,6 +13,8 @@ ms.date: 03/16/2026
 
 # What is Azure Skills?
 
+Azure Skills are agent skills that extend your AI coding assistant with Azure-specific domain knowledge and specialized workflows. They give your assistant the ability to manage resources, deploy applications, and monitor services directly from your development environment.
+
 ## Azure Skills in Visual Studio Code
 
 The following demonstration shows Azure Skills in action inside Visual Studio Code. A developer uses natural language in the Copilot chat panel to interact with Azure services — no portal, no CLI commands, no context switching.

…ls/skills/appinsights-instrumentation.md …s/skills/app-insights-instrumentation.mdarticles/azure-skills/skills/appinsights-instrumentation.md renamed to articles/azure-skills/skills/app-insights-instrumentation.md articles/azure-skills/skills/appinsights-instrumentation.md renamed to articles/azure-skills/skills/app-insights-instrumentation.md

@@ -1,5 +1,5 @@
 ---
-title: Azure skill for Hosted Copilot SDK
+title: Azure skill for hosted Copilot SDK
 description: Build and deploy GitHub Copilot SDK apps to Azure.
 ms.topic: reference
 ms.date: 4/2/2026

…s/azure-skills/skills/azure-aigateway.md …/azure-skills/skills/azure-ai-gateway.mdarticles/azure-skills/skills/azure-aigateway.md renamed to articles/azure-skills/skills/azure-ai-gateway.md articles/azure-skills/skills/azure-aigateway.md renamed to articles/azure-skills/skills/azure-ai-gateway.md

@@ -1,5 +1,5 @@
 ---
-title: Azure skill for Kusto (Data Explorer)
+title: Azure skill for Kusto (Azure Data Explorer)
 description: This skill queries and analyzes data in Azure Data Explorer (also called Kusto or ADX) using Kusto Query Language (KQL) to support log analytics, telemetry monitoring, and time-series analysis.
 ms.topic: reference
 ms.date: 4/2/2026