APIv2 update

.gitignore

.gitlab-ci.yml

CONTRIBUTING.md

LICENSE.txt

README.md

docs/Makefile

docs/_static/coscine_logo_rgb.png

docs/_static/coscine_logo_white_rgb.png

docs/_static/coscine_python_sdk_icon_rgb.png

docs/_static/python-powered-w-200x80.png

docs/_templates/index.rst

docs/api-token.md

docs/api.md

docs/client.md

docs/conf.py

docs/coscine.rst

docs/index.md

docs/installation.md

docs/make.bat

docs/metadata.md