Included 'Next Tutorial' link

gazebo_basics.md

@@ -42,3 +42,5 @@ roslaunch stretch_gazebo stretch_willowgarage_world.launch
 ```
 
 ![image](images/stretch_willowgarage_world.png)
+
+**Next Tutorial:** [Teleoperating Stretch](teleoperating_stretch.md)

getting_started.md

@@ -26,3 +26,5 @@ If a you are unable to dual boot and install ubuntu on your local machine, an al
 
 ## Installing Noetic on Stretch
 Instructions on installing Noetic can be found in our open source [installation guide](https://github.com/hello-robot/stretch_ros/blob/dev/noetic/install_noetic.md).
+
+**Next Tutorial:** [Gazebo Basics](gazebo_basics.md)

teleoperating_stretch.md

@@ -72,3 +72,5 @@ You're ready to go! A few things to try:
 * Try delivering an object to a person
 
 If you're done, hold down the Shutdown PC button for 2 seconds. This will cause the PC to turn off. You can then power down the robot.
+
+**Next Tutorial:** [Internal State of Stretch](internal_state_of_stretch.md)