Rename `pyiron_snippets` to `snippets` #19

Job	Run time
pyiron / commit-updated-env	8s
pyiron / test-alternate-env	0s
pyiron / build-notebooks	57s
pyiron / build-docs	56s
pyiron / unit-tests (ubuntu-latest, 3.12)	44s
pyiron / benchmark-tests	0s
pyiron / unit-tests (ubuntu-latest, 3.11)	53s
pyiron / unit-tests (ubuntu-latest, 3.10)	49s
pyiron / black	8s
pyiron / unit-tests (ubuntu-latest, 3.9)	47s
pyiron / pip-check	46s
pyiron / unit-tests (windows-latest, 3.12)	47s
pyiron / unit-tests (macos-latest, 3.12)	50s
pyiron / coveralls-and-codacy / Tests-and-Coverage	44s
	8m 29s

Provide feedback