Release 1.3.0

Add docs references to `README.md` and bump project to `1.2.2` (#40)

* Add documentation references to `README.md`

- Add status badge linking to the `docs.yml` workflow.
- Add a documentation link in the introduction section pointing to
  the project's GitHub Pages site.

This ensures the documentation is correctly referenced in the
`README.md` file and is easily accessible from external sites like
PyPI.

* Bump project to `1.2.2`

Update `README.md` to install package via PyPI (#38)

* Add PyPI package information to `README.md`

- Update Installation instructions to install the package directly
  from PyPI.
- Add PyPI badge.

* Bump project version to `1.2.1`

Install pytest in Test Main workflow to enable testing (#37)