there has been around a script to automate the screenshots, but personally I never bother using it because taking a screenshot and inserting in pillar is the easiest thing.On macos is just CMD+SHIFT+4 and you just choose the area you want to screenshot and thats it, it takes a second. Documentation itself is the hard part.
Plus I can help with the screenshots , its not big deal. I even have access to the github repo of Mooc but I just try to focus on UPBE.
My connection is down at the moment, but when it will be up again, I will be able to help.