Rely on pre-commit.ci for flake8 test

Author: consideRatio

.github/workflows/test.yml

@@ -49,9 +49,6 @@ jobs:
           pip install .
           pip freeze
 
-      - name: Run flake8 linter
-        run: flake8
-
       - name: Run tests
         run: |
           pytest --verbose --maxfail=2 --color=yes --cov nbgitpuller

dev-requirements.txt

@@ -1,4 +1,3 @@
-flake8
 jupyter-packaging>=0.10
 nbclassic
 pytest

docs/contributing.md

@@ -97,12 +97,6 @@ Hence, nbgitpuller can be developed locally without needing a JupyterHub.
     process (started in step 5) to see your changes take effect. This is not needed if
     you are only working on the javascript or css.
 
-## Running the flake8 linter
-
-[flake8](https://flake8.pycqa.org/en/latest/) is used to validate python coding style. The
-flake8 config is in `.flake8`, and is not super strict. You should be able to run
-`flake8` in the root directory of the repository to get a list of issues to be fixed.
-
 ## Running tests
 
 [pytest](https://docs.pytest.org/) is used to run unit and integration tests,