docs(cookbook): revamp three Falcon AI cookbook pages

[SuhaniNagpal7]

Summary

• Restructure all three Falcon AI cookbook pages: drop TLDR + Tutorial heading, add "What is Falcon AI?" section between Install and Steps, goal-shaped step titles with newcomer-friendly lead-ins, and a "What you solved" + Check + bullets ending.
• Drop tool-specific claims that did not match the no-tool example agents.
• Rename "eval / evaluation dataset" → "golden dataset" in titles, prose, and Card descriptions.

Test plan

• pnpm dev and visit /docs/cookbook/falcon-ai/end-to-end, /context-aware-debugging, /eval-datasets-from-traces
• Confirm "What is Falcon AI?" renders between Install and Steps on each page
• Click each Card in Explore further and confirm cross-links resolve
• Confirm Colab and GitHub badges open the matching notebooks in the cookbooks repo

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