moved IS_EDX_DOMAIN dependent feature to edx.org theme

cms/envs/common.py

cms/templates/widgets/sock.html

common/djangoapps/course_modes/tests/test_views.py

common/djangoapps/edxmako/shortcuts.py

common/djangoapps/edxmako/tests.py

common/djangoapps/student/tests/test_email.py

common/djangoapps/student/tests/tests.py

lms/djangoapps/branding/api.py

lms/djangoapps/branding/tests/test_views.py

lms/djangoapps/branding/views.py

lms/djangoapps/commerce/tests/test_views.py

lms/djangoapps/student_account/test/test_views.py

lms/djangoapps/verify_student/tests/test_views.py

lms/envs/common.py

lms/envs/dev.py

lms/templates/course_modes/choose.html

lms/templates/dashboard.html

lms/templates/emails/activation_email.txt

lms/templates/footer-edx-v3.html

openedx/core/djangoapps/theming/test_util.py