[patch] Fix readme example formatting

[liamhuber]

I don't know what the hell sort of linter madness got a hold of these examples, but they got broken so badly they weren't even being recognized by the test suite as examples so they wouldn't even fail the tests!

[github-actions]

👈 Launch a binder notebook on branch pyiron/pyiron_snippets/fix_readme

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.18% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (0089e58)	556	528	94.96%
Head commit (b43d2e5)	556 (+0)	529 (+1)	95.14% (+0.18%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#26)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[coveralls]

Pull Request Test Coverage Report for Build 10156569319

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 95.144%

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Totals
Change from base Build 10078967399:	0.2%
Covered Lines:	529
Relevant Lines:	556

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💛 - Coveralls