docs(react): update link to react overview (#2605)

fixes #2220

Author: brandyscarney

docs/index.md

@@ -58,7 +58,7 @@ Get started building by [installing Ionic](intro/cli.md) or following our [First
 
 ## Overview
 
-Ionic focuses on the frontend UX and UI interaction of an app — UI controls, interactions, gestures, animations. It's easy to learn, and integrates with other libraries or frameworks, such as [Angular](angular/overview.md), [React](react/overview.md), or [Vue](vue/overview.md). Alternatively, it can be used standalone without any frontend framework using a simple [script include](intro/cdn.md). If you’d like to learn more about Ionic before diving in, we <a href="https://youtu.be/p3AN3igqiRc" target="_blank">created a video</a> to walk you through the basics.
+Ionic focuses on the frontend UX and UI interaction of an app — UI controls, interactions, gestures, animations. It's easy to learn, and integrates with other libraries or frameworks, such as [Angular](angular/overview.md), [React](react.md), or [Vue](vue/overview.md). Alternatively, it can be used standalone without any frontend framework using a simple [script include](intro/cdn.md). If you’d like to learn more about Ionic before diving in, we <a href="https://youtu.be/p3AN3igqiRc" target="_blank">created a video</a> to walk you through the basics.
 
 ### One codebase, running everywhere