Update installation.md

Description:
This pull request addresses a broken link in the react.dev documentation, which was preventing users from seamlessly navigating between documentation sections. By fixing this link, we aim to enhance the user experience by making it easier for developers, especially beginners, to access the correct resources without disruption.

Changes Made:
1. Updated the broken link to direct users to the correct documentation section.
2. Verified the link functionality to ensure smooth navigation.

Author: AdityaSrivastava185

src/content/learn/installation.md

@@ -12,7 +12,7 @@ React has been designed from the start for gradual adoption. You can use as litt
 
 * [How to start a new React project](/learn/start-a-new-react-project)
 * [How to add React to an existing project](/learn/add-react-to-an-existing-project)
-* [How to set up your editor](/learn/editor-setup)
+* [How to set up your editor](https://github.com/reactjs/react.dev/blob/main/src/content/learn/editor-setup.md)
 * [How to install React Developer Tools](/learn/react-developer-tools)
 
 </YouWillLearn>