Improve README.md documentation with comprehensive examples and production guidance

[Copilot]

This PR significantly enhances the README.md documentation to make the Worker project more accessible and production-ready. The improvements address the lack of context about what Ferret is, missing practical examples, and insufficient guidance for different deployment scenarios.

Key Improvements

Enhanced Project Overview

• Added clear explanation of what Ferret Query Language (FQL) is and its purpose
• Explained Worker's role as a REST API server for executing FQL queries
• Listed common use cases: web scraping, automated testing, monitoring, PDF generation, and data collection

Comprehensive Quick Start Guide

• Added prerequisites section with clear requirements
• Improved installation instructions for both Docker and local setups
• Added practical FQL query examples that users can run immediately:

# Simple data extraction
curl -X POST http://localhost:8080/ \
  -H "Content-Type: application/json" \
  -d '{"text": "LET doc = DOCUMENT(\"https://example.com\") RETURN doc.title"}'

# Browser automation with CDP
curl -X POST http://localhost:8080/ \
  -H "Content-Type: application/json" \
  -d '{"text": "LET page = DOCUMENT(\"https://github.com\", { driver: \"cdp\" }) WAIT_ELEMENT(page, \"h1\") RETURN INNER_TEXT(page, \"h1\")"}'

Production-Ready Documentation

• Security considerations: Rate limiting, body size limits, network security best practices
• Configuration examples: Production, development, and specialized deployment scenarios
• Troubleshooting section: Common issues like Chrome connection failures, timeouts, and memory problems
• Health monitoring: Guidance on using /health and /info endpoints

Enhanced API Documentation

• Detailed endpoint documentation with JSON request/response examples
• Multiple FQL query examples covering basic scraping to complex browser automation
• Parameter usage examples showing how to make queries dynamic

Developer Resources

• Build instructions and project structure overview
• Contribution guidelines with proper workflow
• Links to related resources (Ferret docs, OpenAPI spec, container registries)

Impact

The README has grown from 123 to 451 lines with focused, valuable content that:

• Makes the project immediately usable for newcomers
• Provides production deployment guidance for DevOps teams
• Offers comprehensive examples for different use cases
• Includes troubleshooting help to reduce support burden

The changes maintain the existing structure while adding substantial value for both new users and experienced developers looking to deploy Worker in production environments.

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