Update and rename doc/src/index.md to doc/src/learn/index.md (#791)

Moving original landing page to be for Learn now that we have the portal design coming

doc/src/index.md → doc/src/learn/index.md

@@ -3,29 +3,27 @@ title: Sui Developer Guides
 ---
 
 Welcome to the documentation for the Sui platform. Since Sui is built upon the core [Move](https://github.com/MystenLabs/awesome-move) programming language,
-you should familiarize yourself with it and use this content to apply the differences. For a summary of these differences, see [Why Sui?](learn/sui-move-diffs.md)
+you should familiarize yourself with it and use this content to apply the differences. For a summary of these differences, see
+[Sui compared to other blockchains](sui-move-diffs.md).
 
-For a deep dive into Sui technology, see the [Sui Smart Contracts Platform](../paper/sui.pdf) white paper.
+For a deep dive into Sui technology, see the [Sui Smart Contracts Platform](../../../paper/sui.pdf) white paper.
 
 ## Kickstart development
 
 ### Move quick start
-See the [Move Quick Start](build/move.md) for installation, defining custom objects, object operations (create/destroy/update/transfer/freeze), publishing, and invoking your published code.
-<!--- Then deeper: Sui standard library, design patterns, examples. --->
+See the [Move Quick Start](../build/move.md) for installation, defining custom objects, object operations (create/destroy/update/transfer/freeze), publishing, and invoking your published code.
 
 ### Wallet quick start
-See the [Wallet Quick Start](build/wallet.md) for installation, querying the chain, client setup, sending transfer transactions, and viewing the effects.
-<!--- Then deeper: wallet CLI vs client service vs forwarder architecture, how to integrate your code (wallet, indexer, ...) with the client service or forwarder components. --->
+See the [Wallet Quick Start](../build/wallet.md) for installation, querying the chain, client setup, sending transfer transactions, and viewing the effects.
 
 ## Navigate this site
 
 Navigate and search this site however you see fit. Here is the order we recommend if you are new to Sui:
 
-1. [Learn](learn/index.md) about Sui, how it differs from Move, and why you should employ it.
-1. [Build](build/index.md) smart contracts, wallets, authorities, transactions, and more.
-1. [Explore](explore/index.md) NFTs, make transfers, and see the Sui API.
-1. [Contribute]contribute/index.md) to Sui by joining the community, making enhancements, and learning about Mysten Labs.
-
+1. Learn about Sui, how it differs from Move, and why you should employ it starting in this very section.
+1. [Build](../build/index.md) smart contracts, wallets, authorities, transactions, and more.
+1. [Explore](../explore/index.md) NFTs, make transfers, and see the Sui API.
+1. [Contribute](../contribute/index.md) to Sui by joining the community, making enhancements, and learning about Mysten Labs.
 
 ## Use supporting sites