Add Phelel.get_yaml, remove PhelelYaml.set_phonon_info()

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Codecov Report

❌ Patch coverage is 63.63636% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.33%. Comparing base (cba4db8) to head (be2f88b).
⚠️ Report is 8 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/phelel/api_phelel.py	60.00%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #156      +/-   ##
===========================================
- Coverage    68.51%   68.33%   -0.19%     
===========================================
  Files           53       53              
  Lines         6318     6322       +4     
===========================================
- Hits          4329     4320       -9     
- Misses        1989     2002      +13     

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