Auteurs multiples pour les actualités (#2406)

* Setup

* done

* climate

* Update app/models/communication/website/post.rb

Co-authored-by: Sébastien Gaya <sebastien.gaya@gmail.com>

* Update app/services/migrations/authors.rb

Co-authored-by: Sébastien Gaya <sebastien.gaya@gmail.com>

* Update app/services/migrations/authors.rb

Co-authored-by: Sébastien Gaya <sebastien.gaya@gmail.com>

* Update app/services/migrations/authors.rb

Co-authored-by: Sébastien Gaya <sebastien.gaya@gmail.com>

* Fix name

* alpha

* fix

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Co-authored-by: Sébastien Gaya <sebastien.gaya@gmail.com>