Merge branch 'docs' into 'develop'

README.md

docs/source/_images/visit-bridgeserviceurl.png

docs/source/_images/visit-form-redirect.png

docs/source/_static/.gitkeep

docs/source/administration.rst

docs/source/conf.py

docs/source/development.rst

docs/source/endpoints.rst

docs/source/gateway.rst

docs/source/index.rst

docs/source/introduction.rst

stripe_checkout/config.py