Update index.md (#922)

Retitle page to Learning Sui for consistency with other indexes
Add doc@ alias for feedback, ask for direct contributions
Link to contents in Learn section
Make all links relative to bypass issues in portal

doc/src/learn/index.md

@@ -1,10 +1,10 @@
 ---
-title: Sui Developer Guides
+title: Learning Sui
 ---
 
 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
-[Sui compared to other blockchains](sui-move-diffs.md).
+[Sui compared to other blockchains](../learn/sui-move-diffs.md).
 
 For a deep dive into Sui technology, see the [Sui Smart Contracts Platform](../../../paper/sui.pdf) white paper.
 
@@ -20,7 +20,7 @@ See the [Wallet Quick Start](../build/wallet.md) for installation, querying the
 
 Navigate and search this site however you see fit. Here is the order we recommend if you are new to Sui:
 
-1. Learn about Sui, how it differs from Move, and why you should employ it starting in this very section.
+1. Learn [about Sui]((../learn/about-sui.md), how [Sui differs from Move](../learn/why-move.md), and [how Sui works](how-sui-works.md) 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.
@@ -29,9 +29,17 @@ Navigate and search this site however you see fit. Here is the order we recommen
 
 Take note of these related repositories of information to make best use of the knowledge here:
 
+* Original [Move Book](https://move-book.com/index.html) written by a member of the Sui team.
 * [Core Move](https://github.com/diem/move/tree/main/language/documentation) documentation, including:
   * [Tutorial](https://github.com/diem/move/blob/main/language/documentation/tutorial/README.md) - A step-by-step guide through writing a Move module.
   * [Book](https://github.com/diem/move/blob/main/language/documentation/book/src/introduction.md) - A summary with pages on [various topics](https://github.com/diem/move/tree/main/language/documentation/book/src).
   * [Examples](https://github.com/diem/move/tree/main/language/documentation/examples/experimental) - A set of samples, such as for [defining a coin](https://github.com/diem/move/tree/main/language/documentation/examples/experimental/basic-coin) and [swapping it](https://github.com/diem/move/tree/main/language/documentation/examples/experimental/coin-swap).
 * [Awesome Move](https://github.com/MystenLabs/awesome-move/blob/main/README.md) - A summary of resources related to Move, from blockchains through code samples.
 * [Sui API Reference](https://app.swaggerhub.com/apis/MystenLabs/sui-api/0.1 ) - The reference files for the Sui Rest API.
+
+## Provide feedback/make fixes
+
+Send us documentation fixes or requests for improvement at:
+doc@mystenlabs.com
+
+You may also suggest changes to the docs directly in GitHub right here. Simply edit the file in question and generated a pull request. We will get back to you shortly.