Merge PR #4388: Remove gaia docs from sdk repo

README.md

@@ -20,14 +20,6 @@ breaking changes.
 
 **Note**: Requires [Go 1.12+](https://golang.org/dl/)
 
-## Cosmos Hub Mainnet
-
-To run a full-node for the mainnet of the Cosmos Hub, first [install `gaia`](./docs/cosmos-hub/installation.md), then follow [the guide](./docs/cosmos-hub/join-mainnet.md).
-
-For status updates and genesis file, see the
-[launch repo](https://github.com/cosmos/launch).
-
-
 ## Quick Start
 
 To learn how the SDK works from a high-level perspective, go to the [SDK Intro](./docs/intro/README.md).
@@ -36,6 +28,10 @@ If you want to get started quickly and learn how to build on top of the SDK, ple
 
 For more, please go to the [Cosmos SDK Docs](./docs/README.md)
 
+## Cosmos Hub Mainnet
+
+The Cosmos Hub application, `gaia`, has moved to its [own repository](https://github.com/cosmos/gaia). Go there to join the Cosmos Hub mainnet and more.
+
 ## Disambiguation
 
 This Cosmos-SDK project is not related to the [React-Cosmos](https://github.com/react-cosmos/react-cosmos) project (yet). Many thanks to Evan Coury and Ovidiu (@skidding) for this Github organization name. As per our agreement, this disambiguation notice will stay here.

docs/.vuepress/config.js

@@ -33,26 +33,6 @@ module.exports = {
           "/intro/ocap"
         ]
       },
-      {
-        title: "Cosmos Hub",
-        collapsable: true,
-        children: [
-          "/cosmos-hub/what-is-gaia",
-          "/cosmos-hub/installation",
-          "/cosmos-hub/join-mainnet",
-          "/cosmos-hub/validators/validator-setup",
-          "/cosmos-hub/validators/overview",
-          "/cosmos-hub/validators/security",
-          "/cosmos-hub/validators/validator-faq",
-          "/cosmos-hub/delegator-guide-cli",
-          "/cosmos-hub/genesis",
-          "/cosmos-hub/hd-wallets",
-          "/cosmos-hub/ledger",
-          "/cosmos-hub/gaiacli",
-          "/cosmos-hub/join-testnet",
-          "/cosmos-hub/deploy-testnet"
-        ]
-      },
       {
         title: "Tutorial",
         collapsable: true,

docs/README.md

@@ -11,19 +11,17 @@
 - [SDK API Reference](https://godoc.org/github.com/cosmos/cosmos-sdk): Godocs of the Cosmos SDK.
 - [REST API spec](https://cosmos.network/rpc/): List of endpoints to interact with a `gaia` full-node through REST.
 
-## Cosmos Hub 
-
-- [Join the mainnet](./cosmos-hub/join-mainnet.md) of the Cosmos Hub.
-- [Join the latest public testnet](./cosmos-hub/join-testnet.md) of the Cosmos Hub. 
-- [Start your own `gaia` testnet](./cosmos-hub/deploy-testnet.md).
-
 ## Creating a new SDK project
 
 To create a new project, you can either:
 
 - Fork [this repo](https://github.com/cosmos/sdk-application-tutorial/). Do not forget to remove the `nameservice` module from the various files if you don't need it. 
 - Use community tools like [chainkit](https://github.com/blocklayerhq/chainkit).
 
+## Cosmos Hub 
+
+The Cosmos Hub (`gaia`) docs have moved [here](https://github.com/cosmos/gaia/tree/master/docs).
+
 ## Languages
 
 The Cosmos-SDK is currently written in [Golang](https://golang.org/), though the