GitLab

* Reorganize doc for multilingual support

* Fix style

* Style

* Toc trees

* Adapt templates

* Updates the default branch from master to main

* Links from `master` to `main`

* Typo

* Update examples/flax/README.md
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* Spanish translation of the file training.mdx

* Settings - Spanish translation of the file training.mdx

* Latest changes to the Spanish translation of the training.mdx file

* Delete Hugging.mdx

* Last changes to the training fil Espanish version

* Latest modifications

* Latest changes, document ready for PR

* Nits
Co-authored-by: Yhary Arias <yharystefa@gmail.com>
Co-authored-by: Omar U. Espejel <espejelomar@gmail.com>