Add Hinss2021 dataset

[gcattan]

This PR adds the dataset from Neuroergonomic 2021 (https://zenodo.org/records/5055046).

[bruAristimunha]

I'm feeling like this tutorial has a little more content than usual, which is great! However, I think we can adjust the level of explaining to be a little more self-contained:

Overall, I think just adding one note with a basic concept or idea core of the tutorial would be enough. And more comments throughout the whole tutorial.

Some examples:

https://neurotechx.github.io/moabb/auto_examples/plot_benchmark_braindecode.html

With more content:

https://braindecode.org/dev/auto_examples/model_building/plot_how_train_test_and_tune.html#sphx-glr-auto-examples-model-building-plot-how-train-test-and-tune-py

https://braindecode.org/dev/auto_examples/advanced_training/plot_data_augmentation_search.html#sphx-glr-auto-examples-advanced-training-plot-data-augmentation-search-py

https://braindecode.org/dev/auto_examples/model_building/plot_hyperparameter_tuning_with_scikit-learn.html#sphx-glr-auto-examples-model-building-plot-hyperparameter-tuning-with-scikit-learn-py

[bruAristimunha]

Hi @gcattan and @jiggychauhi

Thank you very much for your PR, I did a first review.

One thing that I noticed is that the changes in the dataset summary are missing, and I think the doc details of the classes are wrong, can you regenerate the doc and take a look?

[bruAristimunha]

All good @gcattan!

When everything is green, we can apply the merge; I just corrected some details of the documentation formation that were wrong. I usually use this site to generate these .rst tables https://tableconvert.com/restructuredtext-generator

Thank you for your contribution!

[gcattan]

Ok, thanks @bruAristimunha