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* Clean up sphinx

* Update contributing guide

* Update docs README

* No example title

* Fix copies

* Update CONTRIBUTING.md
Co-authored-by: Lysandre Debut <lysandre@huggingface.co>
Co-authored-by: Lysandre Debut <lysandre@huggingface.co>

* First try

* Update instructions

* PoC for conserving old links

* Do the same for other links

* remap the redirects section

* add instructions on how to move sections

* improve
Co-authored-by: Stas Bekman <stas@stason.org>

* Fix some typos in the docs

* Fix a styling issue

* Fix code quality check error

* How to solve: Title level inconsistent

* list chars

* Add copyright everywhere missing

* Style

* remove references to old API in docstring - update data processors

* style

* fix tests - better type checking error messages

* better type checking

* include awesome fix by @LysandreJik for #5310

* updated doc and examples

* Update installation page and add contributing to the doc

* Remove mention of symlinks

This ensures compatibility with zsh.

Fix #2316.

Use -e only in docs targeted at contributors.

If a user copy-pastes  command line with [--editable], they will hit
an error. If they don't know the --editable option, we're giving them
a choice to make before they can move forwards, but this isn't a choice
they need to make right now.

It's superseded by the "docs" extras.

Co-Authored-By: Lysandre Debut <lysandre.debut@reseau.eseo.fr>

Initial folder structure for the documentation. A draft of documentation change has been made in the BertModel class.