remove submodule

urdf_test_ws/src/urdf_tutorial

urdf_test_ws/src/urdf_tutorial/CHANGELOG.rst

urdf_test_ws/src/urdf_tutorial/CMakeLists.txt

urdf_test_ws/src/urdf_tutorial/LICENSE

urdf_test_ws/src/urdf_tutorial/README.md

urdf_test_ws/src/urdf_tutorial/images/flexible.png

urdf_test_ws/src/urdf_tutorial/images/materials.png

urdf_test_ws/src/urdf_tutorial/images/multipleshapes.png

urdf_test_ws/src/urdf_tutorial/images/myfirst.png

urdf_test_ws/src/urdf_tutorial/images/origins.png

urdf_test_ws/src/urdf_tutorial/images/visual.png

urdf_test_ws/src/urdf_tutorial/launch/display.launch.py

urdf_test_ws/src/urdf_tutorial/mesh/base.stl

urdf_test_ws/src/urdf_tutorial/mesh/rim.stl

urdf_test_ws/src/urdf_tutorial/mesh/roller.stl

urdf_test_ws/src/urdf_tutorial/meshes/l_finger.dae

urdf_test_ws/src/urdf_tutorial/meshes/l_finger_color.png

urdf_test_ws/src/urdf_tutorial/meshes/l_finger_tip.dae

urdf_test_ws/src/urdf_tutorial/meshes/l_finger_tip_color.png

urdf_test_ws/src/urdf_tutorial/package.xml