Update readme documentation for library

[jxnl]

docs: update README.md for clarity and comprehensiveness

Describe your changes

This PR significantly overhauls the README.md to be more comprehensive, clear, and up-to-date. Key changes include:

• Structure: Added a Table of Contents for improved navigation.
• Overview: Refreshed the library description, value proposition, provider coverage, and a "without vs with Instructor" comparison.
• Getting Started: Reworked installation instructions (including uv and provider extras), expanded quick start examples (sync, async, streaming), and detailed feature highlights.
• Provider Coverage: Clarified usage for various LLM providers and native client patching.
• Production Patterns: Documented production-ready patterns like automatic retries, streaming, and nested objects.
• Resources: Added comprehensive links to documentation, examples, blog, and community channels.
• Contributing: Provided clear contributing guidelines.
• License: Included license information.
• Comparison: Added a "Why Instructor over alternatives?" section.

Issue ticket number and link

Checklist before requesting a review

• I have performed a self-review of my code
• If it is a core feature, I have added thorough tests.
• If it is a core feature, I have added documentation.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	instructor	5bce473	Commit Preview URL Branch Preview URL	Nov 25 2025, 05:54 PM