Clean notebook output

Author: lukelbd

docs/.gitattributes

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+# Strip notebook output for diffs and during staging
+# Download with 'pip install nbstripout'
+# See: https://github.com/kynan/nbstripout
+*.ipynb filter=nbstripout
+*.ipynb diff=ipynb

docs/.gitconfig

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+[diff "ipynb"]
+	textconv = nbstripout -t
+[filter "nbstripout"]
+	clean  = "f() { echo >&2 \"clean: nbstripout $1\"; nbstripout; }; f %f"
+	smudge = "f() { echo >&2 \"smudge: cat $1\"; cat; }; f %f"
+	required = true