Merge pull request #4023 from metabase/collections-documentation

docs/administration-guide/05-setting-permissions.md

docs/administration-guide/06-collections.md

docs/administration-guide/07-segments-and-metrics.md

docs/administration-guide/08-configuration-settings.md

docs/administration-guide/09-setting-up-slack.md

docs/administration-guide/10-single-sign-on.md

docs/administration-guide/11-getting-started-guide.md

...tion-guide/images/collections/collections-empty-state.png

...ministration-guide/images/collections/permission-grid.png

docs/administration-guide/start.md

docs/users-guide/05-sharing-answers.md

docs/users-guide/images/SaveButton.png

docs/users-guide/images/question-actions.png

docs/users-guide/images/saved-questions.png