Fix generate.json documentation to use URL parameter

[MrTravisB]

Summary

• Fixed README documentation for generate.json() to correctly show it takes a url parameter, not markdown
• Updated Quick Start section to remove incorrect two-step process
• Updated API Reference section with correct method signature and parameters

Details

The implementation was already correct - generate.json() accepts a URL as per the OpenAPI spec. Only the README had outdated documentation suggesting a two-step process (extract markdown, then generate from markdown).

Changes

• Quick Start: Changed from two-step markdown extraction to direct URL usage
• API Reference: Updated method signature from generate.json(markdown, instructions, schema) to generate.json(url, schema, instructions, nocache=False)
• Updated all example code in documentation

Testing

✅ All 165 tests pass
✅ No code changes needed - implementation was correct

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