ENH: remove GitPod config if `--no-gitpod` #290

Job	Run time
pytest / Determine job matrix	6s
style / Determine skipped pre-commit hooks	11s
pytest / Run unit tests (3.10, ubuntu-22.04)	21s
pytest / Run unit tests (3.11, ubuntu-22.04)	25s
pytest / Run unit tests (3.7, ubuntu-22.04)	25s
pytest / Run unit tests (3.9, ubuntu-22.04)	28s
pytest / Run unit tests (3.6, ubuntu-20.04)	37s
pytest / Run unit tests (3.8, ubuntu-22.04, repoma)	31s
pytest / Run unit tests (3.9, macos-12)	39s
style / Run taplo through pre-commit	33s
style / Run local pre-commit hooks	45s
style / Push changes	0s
	5m 1s

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