[nit] readme and notebook updates

[liamhuber]

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.12%. Comparing base (a981441) to head (474d874).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #65   +/-   ##
=======================================
  Coverage   95.12%   95.12%           
=======================================
  Files          14       14           
  Lines         574      574           
=======================================
  Hits          546      546           
  Misses         28       28           

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