1.0.6 release

[kilianFatras]

What does this PR do?

1. This PR fixes SDE class bugs in utils and mnist notebooks. There was a - sign instead of a + sign in the notebooks and the diffusion coefficient was not correct.
2. This PR refactors the example folder to split the examples into different folders.
3. This PR adds two new tutorials: one on Flow Matching and another one on minibatch OT

Fixes #85

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Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b29d418) 35.90% compared to head (fafa308) 35.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #87      +/-   ##
==========================================
+ Coverage   35.90%   35.92%   +0.01%     
==========================================
  Files          67       67              
  Lines        7419     7399      -20     
==========================================
- Hits         2664     2658       -6     
+ Misses       4755     4741      -14     

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