mise en place strucutre pour la nouvelle documentation

.gitignore

.gitlab-ci.yml

README.md

source/404.md

source/_static/css/custom.css

source/_templates/footer.html

source/_templates/layout.html

source/conf.py

source/git/advanced.md

source/git/index.rst

source/git/introduction.md

source/images/Veremes_Black.svg

source/images/favicon.ico

source/images/logo-menu.png

source/index.rst