adds error message when email is already used and redirects after signup (#64)

* adds support for personnal data

* modifie le form pour inclure la nationalité

* supprime le gg form

* supprime le champ section et ajoute la liste des etablissements

* adapts for user

* adds validation and connects to students api for personnal data

* adds classType field and rgpd info

* corrects scholarships

* removes signup file tab

* minor presentation changes

* deletes random console.log

* changes upload component declarations

* changes upload component declarations

* changes upload component declarations

* changes upload component declarations

* changes upload component declarations

* changes upload component declarations

* changes upload component declarations

* filters if the whole list is sent back

* adds message after personnal data modifications

* improves phone number validation format

* adds message when email already used and redirects after signup