Update AZ-400 course plan for July 2024 objective domain

[timothywarner]

Overview

This PR updates the AZ-400 course plan to align with the July 2024 objective domain changes for the Microsoft DevOps Engineer certification exam.

Key Changes

• Reorganized content into 5 progressive segments (50 minutes each)
• Aligned with latest exam objectives including:
  • GitHub Advanced Security integration
  • Microsoft Defender for Cloud DevOps Security
  • Azure Deployment Environments
  • Enhanced focus on both Azure DevOps and GitHub platforms
• Structured for logical learning progression from foundations to advanced topics
• Added comprehensive exam preparation in final segment

Course Structure

1. DevOps Foundation & Team Setup - Starting the journey with people, process, and tools
2. Source Control & CI Fundamentals - Code management and quality gates
3. Advanced Pipelines & Deployment - From code to cloud with IaC and containers
4. Security, Compliance & Governance - Secure DevOps at scale
5. Monitoring, Feedback & Exam Prep - Production excellence and certification readiness

Benefits

• Modern toolchain focus (VS Code, GitHub Copilot, Cursor AI)
• Enterprise patterns that scale
• Security-first mindset throughout
• Balanced coverage of both Azure DevOps and GitHub
• Practical demos in every segment

Ready for O'Reilly course delivery!