libdnf5-shim 0.1.0

Added:

- Add shim module for `libdnf5_cli`
- pyproject.toml: add `Homepage` to `[project.urls]`

Changed:

- Make `libdnf5` a single-file module instead of a package.
  In case of installation conflicts, `libdnf5/__init__.py` has priority over
  `libdnf5.py`.