Remove all the 'example' stuff

[danielbrownmsm]

Summary
There's still a lot of "ExampleX" files in the code from the WPILib template. We don't need them. Remember to remove both .cpp and .h files. Should be an easy task.

Work Required

• remove ExampleSubsystem
• remove ExampleCommand
• remove deploy/example.txt

Verification

• CI passes
• no files left with "example" in the name

[jkleiber]

@AbbeySieg I think this is a good starter ticket for you, but if you can't use git / wpilib on your computer just let me know and I can give you a different ticket