Add new lab 13: Create workspaces and distribute reports using Power BI

[Copilot]

This PR adds a new comprehensive lab (Lab 13) that teaches students how to create workspaces and distribute reports using Power BI service, covering app creation and different sharing methods.

New Lab Features

The new lab covers all the requested functionality:

• Workspace Management: Creating and managing Power BI workspaces
• Report Publishing: Uploading PBIX files to workspaces and exploring published reports
• Direct Sharing: Sharing reports with direct links and understanding the implications
• App Creation: Building Power BI apps with organized sections and navigation
• Audience Management: Setting up different audiences for app distribution
• Distribution Comparison: Understanding differences between app access vs direct report links

Files Added

Instructions/Labs/13-create-workspaces-distribute-reports.md (241 lines)
Allfiles/Labs/13-create-workspaces-distribute-reports/
├── 13-Starter-Sales Analysis.pbix
└── 13-workspace-app-distribution.zip
Instructions/Labs/Linked_image_Files/
├── 13-create-workspaces-distribute-reports_image01.png
├── 13-create-workspaces-distribute-reports_image02.png
├── 13-create-workspaces-distribute-reports_image03.png
├── 13-create-workspaces-distribute-reports_image04.png
└── 13-create-workspaces-distribute-reports_image05.png

Implementation Details

• Follows Existing Patterns: Uses the same structure, naming conventions, and YAML frontmatter as existing labs (01-12)
• Proper Integration: The Jekyll templating in index.md will automatically discover and list the new lab
• Appropriate Scope: 45-minute lab duration with comprehensive step-by-step instructions
• Asset Reuse: Leverages existing Sales Analysis PBIX from Lab 08 to maintain consistency

Lab Learning Outcomes

Students will learn to:

1. Create and manage Power BI workspaces for collaboration
2. Upload and publish reports to the Power BI service
3. Share reports using direct links and understand security implications
4. Create branded Power BI apps with organized navigation
5. Configure different audiences and permission levels
6. Compare and contrast different sharing and distribution methods

The lab provides practical hands-on experience with Power BI's enterprise distribution features, preparing students for real-world scenarios where they need to distribute reports to different stakeholder groups.

Fixes #286.

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