[lime-users] What are the settings of the precompiled images?

Hello everybody and excuse my poor english. I'm new here and have a lot of questions. In the section "get it" says.. "We offer precompiled firmware images of the LibreMesh stable release (Dayboot Rely 17.06) with generic settings" What are that generic settings? I see three variants in the downloads, default, mini and zero. What are their differences? Where can i look for that? I'm looking in https://github.com/libremesh/lime-sdk. I want to compile from source as a starting point and once i know how it works, and what does each package or protocol, be able to modify it to fit to my needs. I think i could contribute documenting all my questions. I will send more questions. Thanks in advance.