This fall I saw a number of my LibreText sites have a "Front Matter" and "Back Matter" page added. What are these, do we need them, and if not how do we get rid of them without having them automatically added again?

Here are two examples: 
https://socialsci.libretexts.org/Bookshelves/Education_and_Professional_Development/Mobile_Summer_Institute_on_Scientific_Teaching/Generic
https://socialsci.libretexts.org/Courses/Mobile_Summer_Institute_on_Scientific_Teaching/UA_Little_Rock_MoSI

Thanks - mark