Update version to 1.1.0 and enhance documentation

- Bumped version from 1.0.1 to 1.1.0 in package.json and UI
- Updated USER_GUIDE.md with new features in v1.1.0
- Enhanced DEVELOPERS.md with:
  - Information about reusable components (ActionButton, Section)
  - Documentation for type-safe utilities
  - Code examples for performance optimizations
  - Updated best practices
  - Added information about the improved project structure

🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "edison-powerpoint-addin",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "repository": {
     "type": "git",
     "url": "https://github.com/OfficeDev/Office-Addin-TaskPane-React.git"