BREAK: rename package to `sphinx-hep-pdgref` #24

Job	Run time
style / Determine skipped pre-commit hooks	9s
pytest / Determine job matrix	6s
pytest / Run unit tests (3.10, ubuntu-22.04)	27s
pytest / Run unit tests (3.11, ubuntu-22.04)	21s
pytest / Run unit tests (3.7, ubuntu-22.04)	26s
pytest / Run unit tests (3.9, ubuntu-22.04)	28s
pytest / Run unit tests (3.6, ubuntu-20.04)	45s
pytest / Run unit tests (3.8, ubuntu-22.04, sphinx_hep_pdgref)	43s
pytest / Run unit tests (3.9, macos-12)	36s
style / Run taplo through pre-commit	38s
style / Run local pre-commit hooks	44s
style / Push changes	0s
	5m 23s

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