chore: Remove outdated task list documentation and examples from CHANGELOG.md

- Deleted sections related to task list documentation, examples, and tests to streamline the CHANGELOG.
- Focused on maintaining relevant and current information for upcoming releases.

Author: m-brtn

CHANGELOG.md

@@ -19,27 +19,6 @@
   - `TaskListAttrs` - Attributes for task lists (uid)
   - `TaskItemAttrs` - Attributes for task items (checked status)
 
-### Documentation
-
-- Added comprehensive task list documentation in API reference
-- Added nested checklist examples and patterns
-- Updated document structure guide with task list blocks
-- Added task list to supported elements table
-
-### Examples
-
-- `examples/task_list_checklist.py` - Complete examples of task lists usage
-  - Simple checklists
-  - Nested checklists (multi-level)
-  - Mixed content (text + checklists)
-  - Complex nested structures (3+ levels)
-
-### Tests
-
-- Added 8 unit tests for task list functionality
-- Added 4 integration tests with real API
-- All tests passing
-
 ## [0.14.0] - 2025-10-24
 
 ### Added