The `Optional` type was imported from `typing` in `src/yang/paths.py`
but was not being used in the file. This change removes the unnecessary
import to clean up the code.
- Update the dependency installation command in the main README to use `uv sync` instead of `pip`, reflecting the project's package manager.
- Realign markdown tables in `src/yang/README.md` to improve raw text readability and consistency.
