Theme location
From MoodleDocs
Changing theme Location
Starting from Moodle 1.7, the location of themes may be altered, using the variables $CFG->themewww and $CFG->themedir
Note: You are currently viewing documentation for Moodle 3.9. Up-to-date documentation for the latest stable version of Moodle may be available here: Theme location.
Starting from Moodle 1.7, the location of themes may be altered, using the variables $CFG->themewww and $CFG->themedir