This is a resource I am working on that might be useful to people looking to contribute. I have unofficially categorized most the fastai issues here: https://docs.google.com/spreadsheets/d/1CchBT5swpbzxbcVtKMxLcLdicAqkCKTrBH7lgd2_Nfo/edit?usp=sharing
I will be periodically updating this as it is useful to me as well.
If interested follow up here: Categorized github issues