Modification emplacement de la convention généré

fix: made numEtu optional

Generer convention

Merge branch 'generer-convention' of https://github.com/ivanalglave/InternshipManager-Back into generer-convention

fix: change ine to numetu

Added the ability to import multiple people at once using JSON format.

fix: added INE to people

Upload fix

Change token param

fix: added and endpoint to post/delete people in the inner groups of a group

Password haching

feat: password mailed to user after signup using mailgun