You can also look from there, quite extensive list of resources ;)

https://stacker.news/search?q=documentaries

 https://stacker.news/search?q=documentary

I will work on all of these also and will add in the future, need to understand how to categorise them better as there are many. 1 way would be to just publish them of the year they where launched so interested people could see them from newest to oldest, like it is right now, what you think?