docs: Update documentation structure progress with latest achievements

- Update Phase 4 completion percentage to 65%
- Add Common Abbreviations Centralization as a completed task
- Add Repository Organization as a completed task
- Expand next actions with centralization opportunities
- Add NSA/CISA review to next actions
- Update progress tracking with latest accomplishments

Signed-off-by: Aaron Lippold <[email protected]>

Author: aaronlippold

docs/project/documentation-structure-progress.md

@@ -9,7 +9,7 @@ This document tracks the progress of the documentation reorganization and struct
 | **Phase 1**: Restructuring and Security Prioritization | ✅ Completed | Restructured navigation, elevated security content | 100% |
 | **Phase 2**: Learning Path Content Development | ✅ Completed | Created learning paths with security focus | 100% |
 | **Phase 3**: Task-Oriented Content Development | ✅ Completed | Created task-based documentation pages | 100% |
-| **Phase 4**: Navigation Aids and Cross-Links | 🔄 In Progress | Created site index and initial cross-references | 50% |
+| **Phase 4**: Navigation Aids and Cross-Links | 🔄 In Progress | Created site index and initial cross-references | 65% |
 | **Phase 5**: Testing and Refinement | 📋 Not Started | User testing and documentation refinement | 0% |
 
 ## Phase 4 Progress
@@ -19,6 +19,8 @@ This document tracks the progress of the documentation reorganization and struct
 | Site Index Creation | ✅ Completed | Created comprehensive site index with visual enhancements | 100% |
 | Combined UI Enhancement and Cross-Referencing | 🔄 In Progress | Enhancing pages with UI elements and adding cross-references | 20% |
 | Security Standards Integration | ✅ Completed | Added comprehensive NSA/CISA Kubernetes Hardening Guide documentation with detailed mappings | 100% |
+| Common Abbreviations Centralization | ✅ Completed | Created common abbreviations page and removed inline info boxes | 100% |
+| Repository Organization | ✅ Completed | Updated README, .gitignore, and improved git tracking | 100% |
 | Navigation Structure Improvements | 📋 Pending | Implementing navigation aids | 0% |
 | Content Discovery Enhancements | 📋 Pending | Adding content discovery features | 0% |
 
@@ -93,7 +95,11 @@ This document tracks the progress of the documentation reorganization and struct
    - Ensure bidirectional links between all related content
 2. Implement breadcrumb navigation and additional navigation aids
 3. Add content discovery enhancements (tags, "You might also be interested in" sections)
-4. Prepare for Phase 5 testing and refinement
+4. Continue centralizing commonly used content:
+   - Consider creating dedicated glossary page for project-specific terminology
+   - Identify other common sections that could be centralized for consistency
+5. Review all documentation for proper integration of NSA/CISA Kubernetes Hardening Guide references
+6. Prepare for Phase 5 testing and refinement
 
 ## Documentation Structure