refactor: restructure Level 100 and 200 navigation to match Level 300 format

Created module parent pages with has_children: true for organized navigation:

Level 100 (5 modules):
- Module 1: Digital Sovereignty (6 pages)
- Module 2: Microsoft Sovereign Cloud Models (5 pages)
- Module 3: Azure Local Overview (6 pages)
- Module 4: Azure Arc Introduction (5 pages)
- Module 5: Edge RAG Concepts (5 pages)

Level 200 (5 modules):
- Module 1: Azure Local Architecture Deep Dive (5 pages)
- Module 2: Arc Advanced Management (5 pages)
- Module 3: Edge RAG Implementation (5 pages)
- Module 4: Pre-Sales & Solution Design (4 pages)
- Module 5: Compliance & Security Patterns (5 pages)
- Module 6: Hands-On Labs (remains flat under Level 200)

Navigation now shows:
- Level 100 - Foundation (collapsed parent)
  - Digital Sovereignty (expandable module)
    - Digital Sovereignty Overview
    - European Digital Commitments
    - etc.

This matches Level 300's clean, expandable module structure.

Total files updated: 61
- Created: 10 module parent pages
- Updated: 51 child page frontmatter (parent references)

Author: jonathan-vella

docs/level-100/azure-arc-data-services.md

@@ -1,7 +1,7 @@
 ---
 layout: default
 title: Azure Arc Data Services
-parent: Level 100 - Foundation
+parent: Azure Arc Introduction
 nav_order: 4.3
 ---
 

docs/level-100/azure-arc-intro.md

@@ -1,7 +1,7 @@
 ---
 layout: default
 title: Azure Arc Introduction
-parent: Level 100 - Foundation
+parent: Azure Arc Introduction
 nav_order: 4
 ---
 

docs/level-100/azure-arc-kubernetes.md

@@ -1,7 +1,7 @@
 ---
 layout: default
 title: Azure Arc-Enabled Kubernetes
-parent: Level 100 - Foundation
+parent: Azure Arc Introduction
 nav_order: 4.2
 ---
 

docs/level-100/azure-arc-quiz.md

@@ -1,7 +1,7 @@
 ---
 layout: default
 title: Azure Arc Quiz
-parent: Level 100 - Foundation
+parent: Azure Arc Introduction
 nav_order: 4.4
 ---
 

docs/level-100/azure-arc-servers.md

@@ -1,7 +1,7 @@
 ---
 layout: default
 title: Azure Arc-Enabled Servers
-parent: Level 100 - Foundation
+parent: Azure Arc Introduction
 nav_order: 4.1
 ---
 

docs/level-100/azure-local-architecture.md

@@ -1,7 +1,7 @@
 ---
 layout: default
 title: Azure Local Architecture
-parent: Level 100 - Foundation
+parent: Azure Local Overview
 nav_order: 3.1
 ---
 

docs/level-100/azure-local-connected-mode.md

@@ -1,7 +1,7 @@
 ---
 layout: default
 title: Azure Local Connected Mode
-parent: Level 100 - Foundation
+parent: Azure Local Overview
 nav_order: 3.2
 ---
 

docs/level-100/azure-local-disconnected-mode.md

@@ -1,7 +1,7 @@
 ---
 layout: default
 title: Azure Local Disconnected Mode
-parent: Level 100 - Foundation
+parent: Azure Local Overview
 nav_order: 3.3
 ---
 

docs/level-100/azure-local-hardware.md

@@ -1,7 +1,7 @@
 ---
 layout: default
 title: Azure Local Hardware Requirements
-parent: Level 100 - Foundation
+parent: Azure Local Overview
 nav_order: 3.4
 ---
 

docs/level-100/azure-local-overview.md

@@ -1,7 +1,7 @@
 ---
 layout: default
 title: Azure Local Overview
-parent: Level 100 - Foundation
+parent: Azure Local Overview
 nav_order: 3
 ---