Perhaps search for “darktable” rather than “config”… Almost every program of a certain complexity will have something like a “config” directory, not many will have a “darktable” directory.
As for the theory part, you’ve stumbled into a rather complex subject, with some terminology that can be ambiguous (usually context helps, but…). Fortunately, unless you really need high colour accuracy, or are into high-art printing, you can ignore most of it. The reason for that: most of the people who will see your images on screen will know nothing about colour accuracy (nor care about it).
In practice, that would mean stay with the dt defaults, and first figure out how to calibrate and profile your monitor (knowing why those are two separate steps helps).
Cambridge in Colour has a decent series of pages on colour management and such (also on other subjects, accessible from the linked page)