Merge branch 'next_version' into doc_poo

source/_static/ressources/exploitation/1minute.fmw

source/concept/system/general.md

source/concept/system/images/df.png

source/concept/system/images/htop.png

source/concept/system/index.rst

source/concept/system/use_case.md

source/exploitation/gtf.md

source/exploitation/images/mail_template.png

source/exploitation/images/shared_ressource_fme.png

source/exploitation/images/timezone_conf.png

source/exploitation/index.rst

source/exploitation/infogerance.md

source/index.rst