A slate to write and draw on, then export to html

set up Font_height and Line_height globals

I've been resisting this. Why? Maybe push it to all forks.

Created by  Kartik K. Agaram  on March 25, 2023
YD46MI2FYKOWUUVGYRRRSDEXYJUJKZO5RFVUBJBCNMZYVS3MXDAQC
Change contents