Make catalog keyed by name

Author: ColinMcNeil

prompts/catalog.yaml

@@ -1,13 +1,13 @@
 registry:
-  - name: NPM Project Info
+  NPM Project Info:
     description: Get information about an NPM project
     ref: github:docker/labs-ai-tools-for-devs?ref=main&path=prompts/npm-project.md
     icon: https://cdn.jsdelivr.net/npm/simple-icons@v7/icons/npm.svg
-  - name: SQL Agent
+  SQL Agent:
     description: Run a SQL query against a sqlite database
     ref: github:docker/labs-ai-tools-for-devs?ref=main&path=prompts/sql/prompt.md
     icon: https://cdn.jsdelivr.net/npm/simple-icons@v7/icons/sqlite.svg
-  - name: Recommended Tags
+  Recommended Tags:
     description: Get recommended tags for a Docker image
     ref: github:docker/labs-ai-tools-for-devs?ref=main&path=prompts/recommended_tags.md
     icon: https://cdn.jsdelivr.net/npm/simple-icons@v7/icons/docker.svg