Cookbook Introduction rewritten for relevance and more user-friendly experience.

[paytonison]

Summary

Briefly describe the changes and the goal of this PR. Make sure the PR title summarizes the changes effectively.

Motivation

Why are these changes necessary? How do they improve the cookbook?

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For new content

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• I have added a new entry in registry.yaml (and, optionally, in authors.yaml) so that my content renders on the cookbook website.
• I have conducted a self-review of my content based on the contribution guidelines:
  • Relevance: This content is related to building with OpenAI technologies and is useful to others.
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[Copilot]

Pull Request Overview

This PR introduces a new introductory article "OpenAI Cookbook - LLMs 101" and removes the existing "How to work with large language models" article. The changes appear to be updating the cookbook's introductory content with more current information about OpenAI's models and capabilities.

• Adds a new comprehensive introduction to LLMs covering GPT-5, open models, and practical guidance
• Removes the existing introductory article about working with large language models
• Adds author information for the contributor

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
registry.yaml	Adds entry for new LLMs 101 article with metadata and tags
authors.yaml	Adds author profile for paytonison
articles/openai-cookbook-llms-101.md	New introductory article covering current OpenAI models and cookbook usage
articles/how_to_work_with_large_language_models.md	Removes existing introductory article

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