Use local planner in follower only example launch configuration

[betwo]

As mentioned in #21 , specifying a path that points away from the ego-pose in the "follower only" example results in the robot not following the path at all.
This is because the global_planner does not respect the robot's kinematic.

Acceptance criteria:

• Example is enhanced to use the local planner during path following
• The readme files are updated with a hint to this problem