LidarFollowLaunch needs maintenance

[ConnorNovak]

• [ ] Change name to match other launch files
• [ ] Call bringup.launch rather than separately launch all files
• [ ] Document launch file in README.md
• [ ] Update outdated calls (State.cpp, tractor pkg)

[ConnorNovak]

Pull Request #79 Fixes outdated calls and bringup.launch call.

[ConnorNovak]

Pull Request #79 now addresses entire issue.