Update README.md.jinja

Ruff contains both isort and black

template/{{ pypi_name }}/README.md.jinja

@@ -1,9 +1,7 @@
 # {{ project_name }}
 
 [![Poetry](https://img.shields.io/endpoint?url=https://python-poetry.org/badge/v0.json)](https://python-poetry.org/)
-[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/charliermarsh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
-[![Imports: isort](https://img.shields.io/badge/%20imports-isort-%231674b1?style=flat&labelColor=ef8336)](https://pycqa.github.io/isort/)
 [![Checked with mypy](http://www.mypy-lang.org/static/mypy_badge.svg)](http://mypy-lang.org/)
 [![codecov](https://codecov.io/gh/{{ username }}/{{ pypi_name }}/branch/main/graph/badge.svg)](https://codecov.io/gh/{{ username }}/{{ pypi_name }})
 {% if add_docs == "yes" %}[![Documentation Status](https://readthedocs.org/projects/{{ module*name.replace("*", "") }}/badge/?version=stable)](https://{{ module_name.replace("_", "") }}.readthedocs.io/en/stable/?badge=stable){% endif %}