Replace Kiss3d by Bevy for the testbed renderer.

benchmarks3d/joint_revolute3.rs

@@ -82,8 +82,3 @@ pub fn init_world(testbed: &mut Testbed) {
         Point3::new(134.0, 83.0, -116.0),
     );
 }
-
-fn main() {
-    let testbed = Testbed::from_builders(0, vec![("Joints", init_world)]);
-    testbed.run()
-}