update README and TwoMoons example for discussion

[paul-buerkner]

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Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 51.90%. Comparing base (ea0d049) to head (34217d6).

Files with missing lines	Patch %	Lines
bayesflow/approximators/continuous_approximator.py	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #191      +/-   ##
==========================================
+ Coverage   51.76%   51.90%   +0.13%     
==========================================
  Files         141      141              
  Lines        3224     3227       +3     
==========================================
+ Hits         1669     1675       +6     
+ Misses       1555     1552       -3     

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[LarsKue]

Please squash before merging.