release: bump version to 0.3.0

- Refactor Redis backend connection handling and pool management
- Update algorithm implementations with improved type annotations
- Enhance config loader validation with stricter Pydantic schemas
- Improve decorator and middleware error handling
- Expand example scripts with better docstrings and usage patterns
- Add new 00_basic_usage.py example for quick start
- Reorganize examples directory structure
- Fix type annotation inconsistencies across core modules
- Update dependencies in pyproject.toml

.gitignore

@@ -13,4 +13,8 @@ things-todo.md
 .ruff_cache
 .qodo
 .pytest_cache
-.vscode/
+.vscode
+
+docs/_build
+docs/_static
+docs/_templates