MacOS: Support spaces when launching Jupyter-notebook

[jlaurens]

Checklist

• I added a descriptive title
• I searched for other feature requests and couldn't find a duplicate (including also the type-feature tag)
• I confirmed that it's not related to another project (see the above section)

What is the idea?

This feature allows to install anaconda in an external drive which name happens to contain a space.

Actual jupyter-mac.commad is

#!/bin/bash

DIR=$(dirname $0)

$DIR/jupyter-notebook

desired

#!/bin/bash

DIR=$(dirname "$0")

"$DIR"/jupyter-notebook

Why is this needed

No response

What should happen?

No response

Additional Context

No response