Improve README.md with comprehensive repository overview and detailed component descriptions

[Copilot]

This PR addresses the issue of providing more details about what exists within the repository by completely rewriting the README.md to be a comprehensive guide for users.

What Changed

The README.md has been transformed from a basic overview to a detailed guide that helps users understand and navigate the repository's extensive collection of NGWAF integrations and deployments.

Key Improvements

📋 Comprehensive Repository Structure

• Added detailed descriptions for all major directories and components
• Organized content into logical categories: Quick Start, Compute Integration, Enterprise & Advanced, Container/K8s, and Documentation
• Each component now includes purpose, capabilities, and quick start instructions

🗺️ Enhanced Navigation & User Experience

• Added emoji-based section headers for easy visual scanning
• Created an integration types comparison table with complexity levels and "best for" recommendations
• Included a dedicated Quick Start Guide with different paths for different user types

🏗️ Architecture & Visual Documentation

• Added a comprehensive architecture overview with Mermaid diagram showing integration patterns
• Visual representation of how different deployment types connect (Edge, Compute, On-premises/K8s)
• Clear flow from client requests through various NGWAF integration points

📋 Prerequisites & Setup Guidance

• Reorganized prerequisites by integration type (Kubernetes, Container, Compute)
• Added specific tooling requirements for each deployment scenario
• Fixed broken documentation links and added proper references

🔧 Detailed Component Coverage

• gold-standard-starter/: Terraform-based comprehensive setup with security best practices
• ngwaf-terraform-edge-deploy/: Simple VCL service deployment
• ngwaf-compute-integration/: Compute integration with decision engine
• protect-cached-content/: Advanced cached content inspection
• on-prem-ngwaf-integrations/: Complete suite of containerized and K8s deployments

Impact

Users can now:

• Quickly understand what integrations are available in the repository
• Choose the right integration for their specific use case and complexity requirements
• Get started immediately with clear quick start commands
• Understand the architecture and flow of different deployment patterns
• Navigate directly to relevant components without confusion

The README now serves as both an index and a guide, making the repository much more accessible to new users while providing comprehensive reference information for experienced users.

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.