[pre-commit]: added hook to clear Jupyter notebook output cells

.pre-commit-config.yaml

@@ -68,3 +68,11 @@ repos:
     # black-compatible flake-8 config
     args: ['--max-line-length=88',  # black default
            '--extend-ignore=E203']  # E203 is not PEP8 compliant
+
+- repo: local
+  hooks:
+  - id: jupyter-nb-clear-output
+    name: jupyter-nb-clear-output
+    files: \.ipynb$
+    language: system
+    entry: jupyter nbconvert --ClearOutputPreprocessor.enabled=True --inplace