Update md editor preview on the fly
Update md editor preview on the fly

Previously, it was only updated when leaving the text area. Now it is
updated when you stop typing for 400 ms. I thought for a long time that
there the md editor did not support updating the preview, because it
never occurred to me that I could unfocus the text area to preview. This
should make the feature more obvious.

5monkeys/djedi-cms,5monkeys/djedi-cms,5monkeys/djedi-cms