Gamepad tutorial

[henrygerardmoore]

Description

Adds a controller tutorial with the panda arm, closing #38. Also fixes an improperly formatted list from #423.

Checklist

• Required by CI: Code is auto formatted using clang-format
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[tylerjw]

This is awesome, I read through it and it looks really helpful.

[tylerjw]

This seems like it might be more of a HowTo than a tutorial. Do you think it belongs with the other tutorials or should it be somewhere else?

[gavanderhoorn]

Given the fact that the word controller is used for many different things (both in MoveIt as elsewhere), I'd suggest changing this to be clear it's about using a game controller or gamepad (or something similar).

From the PR title I expected to read about MoveIt controllers, or ros2_control controllers or their interaction. The page title mentioned teleoperation, but that still needs a controller, so the focus on the input device wasn't apparent. The gamepad picture made it clear it was about neither.

Perhaps something like "Using a gamepad for teleoperation of a robot arm with servo" (to make it really clear)?

[AndyZe]

Generally looks good. Thanks!

[henrygerardmoore]

Changed the title, switched to a how-to, and changed all occurrences of the word "controller" to "gamepad" for clarity. I also changed the prerequisites section to mention how to ensure your controller is working since the rviz tutorial isn't really a prerequisite. Thanks for the feedback all!