Summary: Claude Code added to product menu

Why It Matters: This shows a new product focus.

What Changed:

• Remove "Chat with Claude" heading
• Add "Product" heading
• Add "Claude Code" link under "Product"
• Remove "Overview" link under "Product"
• Change "Right now, people are asking Claude to rehearse a sales pitch" to "Right now, people are asking Claude to build a bedtime story app"
• Update internal tracking IDs in links