docs: update README to restructure SDK sections and add version links for React Native SDK

Author: lposen

README.md

@@ -15,15 +15,16 @@ Iterable. It supports JavaScript and TypeScript.
 
 <!-- code_chunk_output -->
 
-- [Requirements](#requirements)
-- [Architecture Support](#architecture-support)
-- [Installation](#installation)
-- [Features](#features)
-- [Sample projects](#sample-projects)
-- [Version mapping](#version-mapping)
-- [Release notes, support and troubleshooting](#release-notes-support-and-troubleshooting)
-- [License](#license)
-- [Want to contribute?](#want-to-contribute)
+- [Iterable's React Native SDK](#iterables-react-native-sdk)
+  - [Requirements](#requirements)
+  - [Architecture Support](#architecture-support)
+  - [Installation](#installation)
+  - [Features](#features)
+  - [Sample projects](#sample-projects)
+  - [Version mapping](#version-mapping)
+  - [Release notes, support and troubleshooting](#release-notes-support-and-troubleshooting)
+  - [License](#license)
+  - [Want to contribute?](#want-to-contribute)
 
 <!-- /code_chunk_output -->
 
@@ -90,6 +91,8 @@ For quick reference, the following table lists the versions of the [Android SDK]
 
 | RN SDK Version                                                              | Android SDK Version                                                          | iOS SDK Version |
 | --------------------------------------------------------------------------- | ---------------------------------------------------------------------------- | --------------- |
+| [2.0.3](https://www.npmjs.com/package/@iterable/react-native-sdk/v/2.0.3) | [3.5.2](https://github.com/Iterable/iterable-android-sdk/releases/tag/3.5.2) | [6.5.4](https://github.com/Iterable/swift-sdk/releases/tag/6.5.4)
+| [2.0.2](https://www.npmjs.com/package/@iterable/react-native-sdk/v/2.0.2) | [3.5.2](https://github.com/Iterable/iterable-android-sdk/releases/tag/3.5.2) | [6.5.4](https://github.com/Iterable/swift-sdk/releases/tag/6.5.4)
 | [2.0.1](https://www.npmjs.com/package/@iterable/react-native-sdk/v/2.0.1) | [3.5.2](https://github.com/Iterable/iterable-android-sdk/releases/tag/3.5.2) | [6.5.4](https://github.com/Iterable/swift-sdk/releases/tag/6.5.4)
 | [2.0.0](https://www.npmjs.com/package/@iterable/react-native-sdk/v/2.0.0) | [3.5.2](https://github.com/Iterable/iterable-android-sdk/releases/tag/3.5.2) | [6.5.4](https://github.com/Iterable/swift-sdk/releases/tag/6.5.4)
 | [2.0.0-beta.1](https://www.npmjs.com/package/@iterable/react-native-sdk/v/2.0.0-beta.1) | [3.5.2](https://github.com/Iterable/iterable-android-sdk/releases/tag/3.5.2) | [6.5.4](https://github.com/Iterable/swift-sdk/releases/tag/6.5.4)