"pip install -e . --user" adds path to sys.path of all environments, which is not great

[cromin]

Hi! One feedback about the setup instructions is that "pip install -e . --user" seemed to add the path to all of my envs sys.path which is nonideal for me, and probably to many others too, and caused some bafflement when I was trying to understand where this path was originating from to my other envs, and how to get rid of it. Deleting the .egg-link file seemed to solve this.

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