Clone 3.2 docs for 4.0

docs/4.0.yaml

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+site_name: Gravitational Teleport
+site_url: https://gravitational.com/teleport/docs
+repo_url: https://github.com/gravitational/teleport
+site_description: SSH and Kubernetes Gateway for Clusters and Teams
+site_author: Gravitational Inc
+copyright: Gravitational Inc, 2016-19
+
+# output directory:
+site_dir: ../build/docs/4.0
+docs_dir: "4.0"
+
+theme: readthedocs
+theme_dir: theme
+markdown_extensions:
+  - markdown_include.include
+  - admonition
+  - def_list
+  - footnotes
+extra_css: []
+extra_javascript: []
+extra:    
+    version: 4.0
+pages:
+    - Documentation:
+        - Introduction: intro.md
+        - Quick Start Guide: quickstart.md
+        - Architecture: architecture.md
+        - User Manual: user-manual.md
+        - Admin Manual: admin-guide.md
+        - FAQ: faq.md
+    - Teleport Enterprise:
+        - Introduction: enterprise.md
+        - Quick Start Guide: quickstart-enterprise.md
+        - RBAC: ssh_rbac.md
+        - Single sign-on (SSO): ssh_sso.md
+    - Guides:
+        - Okta: ssh_okta.md
+        - Active Directory (ADFS): ssh_adfs.md
+        - One Login: ssh_one_login.md
+        - OIDC: oidc.md
+        - Trusted Clusters: trustedclusters.md
+        - Kubernetes Guide: kubernetes_ssh.md

docs/4.0/README.md

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+# Overview
+
+## Introduction
+
+Gravitational Teleport ("Teleport") is a tool for remotely accessing isolated clusters of 
+Linux servers via SSH or HTTPS. Unlike traditional key-based access, Teleport 
+enables teams to easily adopt the following practices:
+
+- Avoid key distribution and [trust on first use](https://en.wikipedia.org/wiki/Trust_on_first_use) issues by using auto-expiring keys signed by a cluster certificate authority (CA).
+- Enforce 2nd factor authentication.
+- Connect to clusters located behind firewalls without direct Internet access via SSH bastions.
+- Record and replay SSH sessions for knowledge sharing and auditing purposes.
+- Collaboratively troubleshoot issues through session sharing.
+- Discover online servers and Docker containers within a cluster with dynamic node labels.
+
+Teleport is built on top of the high-quality [Golang SSH](https://godoc.org/golang.org/x/crypto/ssh) 
+implementation and it is fully compatible with OpenSSH.
+
+## Why Build Teleport?
+
+Mature tech companies with significant infrastructure footprints tend to implement most
+of these patterns internally. Teleport allows smaller companies without 
+significant in-house SSH expertise to easily adopt them, as well. Teleport comes with an 
+accessible Web UI and a very permissive [Apache 2.0](https://github.com/gravitational/teleport/blob/master/LICENSE)
+license to facilitate adoption and use.
+
+Being a complete standalone tool, Teleport can be used as a software library enabling 
+trust management in complex multi-cluster, multi-region scenarios across many teams 
+within multiple organizations.
+
+## Who Built Teleport?
+
+Teleport was created by [Gravitational Inc](https://gravitational.com). We have built Teleport 
+by borrowing from our previous experiences at Rackspace. It has been extracted from [Telekube](https://gravitational.com/telekube/), our system for helping our clients to deploy 
+and remotely manage their SaaS applications on many cloud regions or even on-premise.
+
+## Resources
+To get started with Teleport we recommend starting with the [Architecture Document](architecture.md). Then if you want to jump right in and play with Teleport, you can read the [Quick Start](quickstart.md). For a deeper understanding of how everything works and recommended production setup, please review the [Admin Manual](admin-guide.md) to setup Teleport and the [User Manual](user-manual.md) for daily usage. There is also an [FAQ](faq.md) where we'll be collecting common questions. Finally, you can always type `tsh`, `tctl` or `teleport` in terminal after Teleport has been installed to review those reference guides.
+
+The best way to ask questions or file issues regarding Teleport is by creating a Github issue or pull request. Otherwise, you can reach us through the contact form or chat on our [website](https://gravitational.com/).
+