Merge branch 'update-orga' into 'main'

orga/README.md

orga/attendance_certificate/.gitignore

orga/attendance_certificate/certificate.tex

orga/attendance_certificate/logo/cnrs.pdf

orga/attendance_certificate/logo/ensl.pdf

orga/attendance_certificate/logo/inserm.pdf

orga/attendance_certificate/logo/ucbl.pdf

orga/deprecated/mail_to_wifi_account.sh

orga/deprecated/wifi_account_2_login.sh

orga/form/yakform_call_trainer_r.txt

orga/form/yakform_registration_r.txt

orga/ifb_cloud_group_desc.md

orga/mail/mail_call_trainer.txt

orga/mail/mail_registration.txt