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

Before submitting

• [x] Did you make sure title is self-explanatory and the description concisely explains the PR?
• [x] Did you make sure your PR does only one thing, instead of bundling different changes together?
• [x] Did you list all the breaking changes introduced by this pull request?
• [x] Did you test your PR locally with pytest command?
• [x] Did you run pre-commit hooks with pre-commit run -a command?

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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