Remove the setting of the HOME environment variable during setup.
Remove the setting of the HOME environment variable during setup.

This was causing issues when running Datalab on Windows, as strange
issues seem to occur if you have your HOME variable set to an
externally mapped volume on Windows.

googledatalab/datalab,craigcitro/datalab,googledatalab/datalab,yebrahim/datalab,googledatalab/datalab,yebrahim/datalab,googledatalab/datalab,craigcitro/datalab,googledatalab/datalab,parthea/datalab,yebrahim/datalab,yebrahim/datalab,craigcitro/datalab,googledatalab/datalab,parthea/datalab,craigcitro/datalab,parthea/datalab,yebrahim/datalab,parthea/datalab,parthea/datalab,parthea/datalab,craigcitro/datalab