fix edit page height, padding, and missing line numbers (#1027)
fix edit page height, padding, and missing line numbers (#1027)

Remove extra top and bottom padding
Fix height being set to greater than 100%
Added missing line numbers in the text editor
parthea/datalab,googledatalab/datalab,craigcitro/datalab,googledatalab/datalab,parthea/datalab,googledatalab/datalab,craigcitro/datalab,googledatalab/datalab,parthea/datalab,yebrahim/datalab,parthea/datalab,craigcitro/datalab,googledatalab/datalab,yebrahim/datalab,yebrahim/datalab,parthea/datalab,yebrahim/datalab,parthea/datalab,craigcitro/datalab,craigcitro/datalab,yebrahim/datalab,googledatalab/datalab