Add pre-commit hook for rendering notebooks

.pre-commit-config.yaml

@@ -0,0 +1,10 @@
+repos:
+- repo: local
+  hooks:
+  - id: nbconvert
+    name: Convert Jupyter Notebooks to Markdown
+    language: system
+    entry: ./.pre-commit/run-nbconvert.sh
+    files: ^.*\.ipynb$
+    pass_filenames: true
+    fail_fast: true

.pre-commit/run-nbconvert.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+set -e
+
+for nb in "$@"; do
+	echo "Converting $nb to markdown..." >&2
+	out_dir="$(dirname "$nb")"
+	jupyter nbconvert "$nb" --to markdown --output-dir "$out_dir/rendered"
+done