[ create_a_model.mdx ] translate to pt (#18098)
* [ fast_tokenizers.mdx ] - Added translation to portuguese to tutorial
* Delete docs/source/pt-br directory
* [ fast_tokenizers.mdx ] - Continuing work on file
* [ fast_tokenizers.mdx ] - Continuing work on file
* Add fast tokenizers to _toctree.yml
* Eliminated config and toctree.yml
* Nits in fast_tokenizers.mdx
* Finishing create_a_model
* [ create_a_model.mdx ] finishing create a model in pt-br
* [ Changing _toctree.yml ] adding create a model in pt
Co-authored-by: Omar U. Espejel <espejelomar@gmail.com>
