Now that the technical architecture for the section topics pipeline is completed as per T311734, let's document it onwiki at https://www.mediawiki.org/wiki/Structured_Data_Across_Wikimedia/Section_Topics/Data_Pipeline
Documentation can be similar to what we did for the image suggestions pipeline here: https://www.mediawiki.org/wiki/Structured_Data_Across_Wikimedia/Image_Suggestions/Data_Pipeline