[Jan Egil Ring (janegilring)]

This pull request updates the Challenge 6 (Sovereign Hybrid Cloud with Azure Arc & Azure Local) lab to use only Azure Arc Jumpstart LocalBox, removing all references to ArcBox. The instructions, cost estimates, and permissions guidance are refocused on participants provisioning and managing their own VM in LocalBox, with exercises streamlined to cover guest management, Defender for Cloud, and Update Manager. The ArcBox deployment script and documentation are removed to simplify setup and reduce confusion.

Challenge 6 Lab Refocus and Streamlining:

• Challenge 6 instructions and scenario now use only Azure Arc Jumpstart LocalBox; all references to ArcBox and shared Arc-enabled servers are removed. Exercises focus on provisioning a VM, enabling guest management, verifying Defender for Servers coverage, and using Update Manager. [1] [2]
• Success criteria and actions are updated to match the new workflow (provisioning your own VM, verifying guest management, Defender, and Update Manager results).

Documentation and Permissions Updates:

• Prerequisites and cost estimates are updated to remove ArcBox, clarify LocalBox requirements, and include Defender for Servers budgeting. [1] [2] [3]
• Permissions and readiness guidance are rewritten for LocalBox-only scenarios, including Defender for Servers plan enablement, Security Reader access, and step-by-step environment testing before the event. [1] [2]

Code and Deployment Cleanup:

• The deploy-arcbox.ps1 script and ArcBox-specific instructions are removed from the repository, ensuring only LocalBox deployment remains. [1] [2] [3]
• All documentation and walkthroughs are updated for clarity and to ensure participants only interact with their own resources in LocalBox. [1] [2]

These changes simplify the Challenge 6 experience, reduce Azure costs, and improve security by ensuring each participant only manages their own VM in a shared LocalBox environment.