Update docs site pages to cover newer projects

[scouturier]

Summary

The MkDocs documentation site (mkdocs.yml → docs/, published via .github/workflows/docbuild.yml) is out of date. The nav currently lists only 6 demo projects, but the repository has since grown to include several additional projects that have README.mds but no corresponding doc pages and no nav entries.

Currently documented (in mkdocs.yml nav)

• Classification with Intercom
• Claude Multimodal LLM Playground
• Claude Tools Chatbot
• Complex Schema Tool Use
• Metaprompt Generator
• PDF Knowledge Base with Citations

Projects in the repo missing from the docs

• advanced-claude-code-patterns
• agent-sdk-agentcore-memory
• claude-agent-sdk-dynamic-skills-on-agentcore
• claude-agent-sdk-on-agentcore
• claude-code-on-agentcore
• cowork-3p-in-bedrock
• medical-idp
• claude-platform-on-aws (no README yet)

Proposed work

• Add a doc page under docs/projects/ for each undocumented project (source from each project's README.md).
• Add corresponding entries to the nav in mkdocs.yml.
• Update docs/index.md (currently just a title) with a short landing/overview of the projects.
• Verify images referenced by new pages are picked up by copy_subproject_images.py / build_docs.sh.
• Build the site locally (mkdocs build) to confirm no broken links or nav errors before merge.