Merge branch 'try_notebook_stripout' into 'master'

give a try to notebook stripout

See merge request formations/cpp/gettingstartedwithmoderncpp!70

.pre-commit-config.yaml

+repos:
+- repo: https://github.com/kynan/nbstripout
+  rev: 0.7.1
+  hooks:
+  -   id: nbstripout

CONTRIBUTING.md

@@ -7,13 +7,12 @@ All contributions are welcome, but please read this first.
 If you intend to contribute, please install first the pre-commit hook:
 
 ```shell
-cp Scripts/pre-commit .git/hooks/pre-commit
+conda install -c conda-forge pre-commit # or pip install pre-commit
+pre-commit install
 ```
 
 This hook clears executed cells when committing a notebook.
 
-You need [nbconvert](https://nbconvert.readthedocs.io/en/latest/) to be installed for this pre-commit hook to work properly; it is done automatically if you're using the provided miniconda environment.
-
 
 ## Workflow
 

Scripts/pre-commit

-#!/bin/bash
-
-# This file is expected to be use as pre-commit git hook; copy it in .git/hooks/
-
-file_list=`git diff --cached --diff-filter=ACM --name-only`
-
-for file in ${file_list}
-do
-  if [ "${file##*.}" = "ipynb" ]; then
-    echo "Clear cells from ${file}"
-    jupyter nbconvert --clear-output --inplace ${file}
-    git add ${file}
-  fi
-done

environment.yml

@@ -4,4 +4,3 @@ channels:
 dependencies:
   - jupyterlab
   - xeus-cling
-  - nbconvert