flaked out and forgot to install pre-commit hook to clear notebooks. …

…testing now.

.pre-commit-config.yaml

@@ -4,6 +4,6 @@ repos:
       - id: jupyter-nb-clear-output
         name: jupyter-nb-clear-output
         files: \.ipynb$
-        stages: [commit]
+        stages: [pre-commit]
         language: system
         entry: jupyter nbconvert --ClearOutputPreprocessor.enabled=True --inplace