feat: Update documentation structure and content

- Added a link to the Recent Improvements section in the README.md for better visibility of new features.
- Removed the SEARCH_FILTER_FIX.md file as its content has been integrated into other documentation.
- Deleted the consolidate_docs.py script as its functionality is no longer needed after the documentation consolidation.
- Removed the outdated CHANGELOG.md file and replaced it with a new structure that consolidates all changelog information.
- Created a new DOCUMENTATION_INDEX.md file to provide a comprehensive guide to the documentation structure.
- Updated the docs/README.md to reflect the new documentation organization and included links to preserved legacy documentation.

docs/README.md

@@ -30,24 +30,30 @@ This documentation has been **consolidated and reorganized** for better navigati
 #### Project Information
 - **[Main README](../README.md)** - Project overview and quick start
 - **[Changelog](../CHANGELOG.md)** - Version history and release notes
+- **[Recent Improvements](../IMPROVEMENTS_SUMMARY.md)** - Latest enhancements and new features
 
-### 📁 Legacy Documentation (Preserved)
+## <20>️ Legacy Reference Files
 
-The following files are preserved for reference but content has been consolidated:
+The following specialized documentation files are preserved in the docs/ folder:
 
-#### Original Structure
-- `FEATURES.md` → Content moved to `USER_GUIDE.md`
-- `KEYBOARD_SHORTCUTS.md` → Content moved to `USER_GUIDE.md`
-- `DEVELOPMENT.md` → Content moved to `DEVELOPER_GUIDE.md`
-- `TESTING.md` → Content moved to `DEVELOPER_GUIDE.md`
-- `EXPORT_SYSTEM.md` → Content moved to `API_REFERENCE.md`
-- `MENU_THEMING.md` → Content moved to `API_REFERENCE.md`
+### Feature Documentation
+- **[FEATURES.md](FEATURES.md)** - Original feature documentation (consolidated into USER_GUIDE.md)
+- **[KEYBOARD_SHORTCUTS.md](KEYBOARD_SHORTCUTS.md)** - Original shortcuts reference (consolidated into USER_GUIDE.md)
+- **[EXPORT_SYSTEM.md](EXPORT_SYSTEM.md)** - Original export documentation (consolidated into API_REFERENCE.md)
+- **[MENU_THEMING.md](MENU_THEMING.md)** - Original theming documentation (consolidated into API_REFERENCE.md)
 
-#### Migration Benefits
-1. **Reduced Redundancy**: Eliminated duplicate content across multiple files
-2. **Better Organization**: Logical grouping by user type and purpose
-3. **Easier Navigation**: Clear entry points for different audiences
-4. **Comprehensive Coverage**: All information preserved and enhanced
+### Development Documentation
+- **[DEVELOPMENT.md](DEVELOPMENT.md)** - Original development guide (consolidated into DEVELOPER_GUIDE.md)
+- **[TESTING.md](TESTING.md)** - Original testing documentation (consolidated into DEVELOPER_GUIDE.md)
+
+### System Documentation
+- **[DOCUMENTATION_SUMMARY.md](DOCUMENTATION_SUMMARY.md)** - Documentation organization summary
+
+> **Note**: These files are preserved for reference but their content has been consolidated into the main documentation files for better organization and reduced redundancy.
+
+---
+
+**📖 For complete documentation navigation, see: [DOCUMENTATION_INDEX.md](DOCUMENTATION_INDEX.md)**
 5. **Maintainability**: Fewer files to keep synchronized
 
 ### 🚀 Quick Navigation