Add a tutorial notebook for Blackjack-v1

[till2]

This PR adds the Blackjack-v1 tutorial for gym version v26.

The notebook should be compatible with Sphinx according to the Sphinx-Notebook docs.

If any changes to the tutorial are needed please let me know.

[pseudo-rnd-thoughts]

Currently, we only support python files not jupyter notebook though we plan to add this. You can possibly use this example https://gist.github.com/chsasank/7218ca16f8d022e02a9c0deb94a310fe

[till2]

Converted it to a python file. @pseudo-rnd-thoughts

[till2]

Resolved the formatting & it is below 100k episodes now (with still mostly decent results).
Can you test if the AE-loop picture at the top shows up (if the link works)? @mgoulao

Also removed LaTeX plot labels (to have less dependencies).

[pseudo-rnd-thoughts]

@till2 For the future, could you resolve comments that you have solved along with a reaction or comment just so it is easier to know the progress of the PR.

[pseudo-rnd-thoughts]

@till2 I think this is close to merging. Could you fix the pre-commit issues, https://github.com/Farama-Foundation/Gymnasium/blob/main/CONTRIBUTING.md

[till2]

@till2 I think this is close to merging. Could you fix the pre-commit issues, https://github.com/Farama-Foundation/Gymnasium/blob/main/CONTRIBUTING.md

Should work now, it's passing locally.

[till2]

Great, ready to merge @pseudo-rnd-thoughts