Add Related Repositories section to index.md

Link to sibling workshops and the Agentic Accelerator Framework
for cross-navigation between related workshop repositories.

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

Author: emmanuelknafo

index.md

@@ -172,6 +172,15 @@ graph LR
 
 > **Tip**: This workshop is designed for GitHub Codespaces. Click **Code → Codespaces → New codespace** to get a pre-configured environment with all tools installed.
 
+## Related Repositories
+
+| Repository | Description |
+|------------|-------------|
+| [Agentic Accelerator Framework](https://github.com/devopsabcs-engineering/agentic-accelerator-framework) | Agent definitions, instructions, skills, and CI/CD workflows |
+| [Agentic Accelerator Workshop](https://devopsabcs-engineering.github.io/agentic-accelerator-workshop/) | Hands-on workshop for AI-powered Accelerator agents |
+| [Accessibility Scan Workshop](https://devopsabcs-engineering.github.io/accessibility-scan-workshop/) | WCAG 2.2 accessibility scanning workshop |
+| [Code Quality Scan Workshop](https://devopsabcs-engineering.github.io/code-quality-scan-workshop/) | Code quality scanning workshop |
+
 ## License
 
 This project is licensed under the [MIT License](LICENSE).