We stopped publishing it years ago because doxygen kept leaking our source code into the html documentation release. The last one we published was probably for 3.4 (https://www.rosettacommons.org/manuals/archive/rosetta3.4_user_guide/inherits.html), which is obviously missing a lot of new stuff but ok for global structure of Rosetta.
Generally Rosetta follows two rules:
1) A file’s name is that class’s name and vice versa: Pose is defined in Pose.hh
2) A file’s place in a directory structure is a class’s place in C++ namespace: core::pose::Pose is defined in core/pose/Pose.hh
That will get you to 90% of places. ack-grep will get you to the rest ( https://beyondgrep.com/)