Add RAG Azure Builder extension to community catalog

[mnriem]

Summary

• Add RAG Azure Builder extension to community catalog
• Update community extensions documentation table

Validation

• Repository exists and is public
• extension.yml, README.md, and LICENSE are present
• Release tag v1.2.0 exists
• Download URL points to archive/refs/tags/v1.2.0.zip
• catalog.community.json validates as JSON

Closes #2665

cc @Sertxito

[Copilot]

Pull request overview

Adds the “RAG Azure Builder” community extension to Spec Kit’s community extension discovery surfaces, aligning the JSON catalog entry and the documentation table.

Changes:

• Added a new rag-azure-builder entry to extensions/catalog.community.json (including metadata like version, URLs, tags, and timestamps).
• Added “RAG Azure Builder” to the Community Extensions documentation table in docs/community/extensions.md.

Show a summary per file

File	Description
extensions/catalog.community.json	Adds the rag-azure-builder extension entry (id-sorted placement, complete metadata).
docs/community/extensions.md	Adds the extension to the community extensions table (name-sorted placement).

Copilot's findings

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• Files reviewed: 2/2 changed files
• Comments generated: 0