Remove Task cells from solution notebooks

[sebherbert]

Hi all :)

Short suggestion for read the notebooks.
I'm not sure the TASK cells in the solution notebooks help understand better and they make for almost duplicated cells in notebooks that are already pretty dense. For reading simplicity, I would remove the task cells from the notebooks.
I understand the convert-solution is removing the any cell containing the solution string, maybe this could be reapplied on the solution notebooks and remove cells containing TASK instead?