Rename `pyiron_snippets` to `snippets` #20

Job	Run time
pyiron / commit-updated-env	6s
pyiron / test-alternate-env	0s
pyiron / build-docs	1m 6s
pyiron / unit-tests (ubuntu-latest, 3.12)	48s
pyiron / unit-tests (ubuntu-latest, 3.11)	53s
pyiron / unit-tests (ubuntu-latest, 3.10)	54s
pyiron / unit-tests (ubuntu-latest, 3.9)	52s
pyiron / build-notebooks	1m 15s
pyiron / unit-tests (windows-latest, 3.12)	2m 49s
pyiron / unit-tests (macos-latest, 3.12)	1m 34s
pyiron / benchmark-tests	0s
pyiron / black	10s
pyiron / pip-check	55s
pyiron / coveralls-and-codacy / Tests-and-Coverage	1m 7s
	12m 29s

Provide feedback