Update index.md (MystenLabs#779)

Fix links in README broken by subdir moves

doc/src/index.md

@@ -5,16 +5,16 @@ 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)
 
-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](move.md) for installation, defining custom objects, object operations (create/destroy/update/transfer/freeze), publishing, and invoking your published code.
+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. --->
 
 ### Wallet quick start
-See the [Wallet Quick Start](wallet.md) for installation, querying the chain, client setup, sending transfer transactions, and viewing the effects.
+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. --->
 
 ## Navigate this site