Add notebook on ConvMixer implementation

[BrayanQuintero123]

Description

implementation of the "ConvMixer" architecture presented in the paper "Patches Are All You Need?"

Checklist

Ensure your pull request meets the following requirements:

• I have reviewed existing notebooks to avoid duplications.
• My notebook is fully executed.
• I have included a list of all libraries and their versions used in the notebook.
• The notebook file is named clearly to reflect the topic (e.g., cross-entropy-loss.ipynb).
• I have placed the notebook in the appropriate directory under notebooks/.
• My code is simple, precise, and adheres to good coding practices..

[guillepinto]

the notebook name must be completely in lower case, you must also update it in the csv, see rules

[BrayanQuintero123]

changes made in another commit called "change the name of the notebook and the csv name".

[guillepinto]

It seems I didn't make myself understood, check the comments again, please

[guillepinto]

As I said in the other comment, the name of the .ipynb must be completely lowercase

[BrayanQuintero123]

changes made in another commit called "Change the Csv name to lowercase".

[guillepinto]

The name of the .ipynb FILEE must be completely in lowercase 😭 (ConvMixer.ipynb -> convmixer.ipynb)

[BrayanQuintero123]

changes made in another commit called "only lower case".

[jorge1b3]

The notebooks table data file has made changes that now make conflicts with the changes that you proposed. Please fix it.

[BrayanQuintero123]

changes made in another commit called "conflicts resolved with main".

[guillepinto]

LGTM