Docs: Fix broken links to the removed JavaScript build setup guide.

docs/contributors/documentation/README.md

@@ -54,7 +54,7 @@ To update an existing page:
 
 ### Create a new document
 
-To add a new document requires a working JavaScript development environment to build the documentation, see the [JavaScript build setup documentation](/docs/how-to-guides/javascript/js-build-setup.md):
+To add a new document requires a working JavaScript development environment to build the documentation, see the [Working with JavaScript for the Block Editor](/docs/getting-started/fundamentals/javascript-in-the-block-editor.md) guide:
 
 1. Create a Markdown file in the [docs](https://github.com/WordPress/gutenberg/tree/HEAD/docs) folder, use lower-case, no spaces, if needed a dash separator, and `.md` extension.
 2. Add content using markdown notation. All documents require one and only `h1` tag.

docs/how-to-guides/block-tutorial/README.md

@@ -6,6 +6,6 @@ To follow along with this tutorial, you can download the [accompanying WordPress
 
 > To find the latest version of the .zip file go to the repo's [releases page](https://github.com/WordPress/block-development-examples/releases) and look in the latest release under 'Assets'.
 
-Code snippets are provided in two formats "JSX" and "Plain". JSX refers to JavaScript code that uses JSX syntax which requires a build step. Plain refers to "classic" JavaScript that does not require building. You can change between them using tabs found above each code example. Using JSX, does require you to run [the JavaScript build step](/docs/how-to-guides/javascript/js-build-setup/) to compile your code to a browser compatible format.
+Code snippets are provided in two formats "JSX" and "Plain". JSX refers to JavaScript code that uses JSX syntax which requires a build step. Plain refers to "classic" JavaScript that does not require building. You can change between them using tabs found above each code example. Using JSX, does require you to run [the JavaScript build step](/docs/getting-started/fundamentals/javascript-in-the-block-editor.md) to compile your code to a browser compatible format.
 
 Note that it is not required to use JSX to create blocks or extend the editor, you can use classic JavaScript. However, once familiar with JSX and the build step, many developers tend to find it is easier to read and write, thus most code examples you'll find use the JSX syntax.

docs/how-to-guides/data-basics/1-data-basics-setup.md

@@ -195,7 +195,7 @@ add_action( 'admin_enqueue_scripts', 'load_custom_wp_admin_scripts' );
 
 ## Setting up the build pipeline
 
-This tutorial will proceed assuming the reader is familiar with ESNext syntax and the concept of build tools (like webpack). If that sounds confusing, you may want to review the [Getting started with JavaScript Build Setup](/docs/how-to-guides/javascript/js-build-setup.md) first.
+This tutorial will proceed assuming the reader is familiar with ESNext syntax and the concept of build tools (like webpack). If that sounds confusing, you may want to review the [Working with JavaScript for the Block Editor](/docs/getting-started/fundamentals/javascript-in-the-block-editor.md) guide first.
 
 To install the build tool, navigate to the plugin directory using your terminal and run `npm install`.
 

docs/how-to-guides/platform/README.md

@@ -51,7 +51,7 @@ You can then add a scripts section to your package.json file, for example:
 
 You can then use `npm run build` to build your project with all the default webpack settings already configured, likewise for formatting and linting. The `start` command is used for development mode. See the [`@wordpress/scripts` package](/packages/scripts/README.md) for full documentation.
 
-For more info, see the [Getting Started with JavaScript tutorial](/docs/how-to-guides/javascript/js-build-setup.md) in the Block Editor Handbook.
+For more info, see the [Working with JavaScript for the Block Editor guide](/docs/getting-started/fundamentals/javascript-in-the-block-editor.md) in the Block Editor Handbook.
 
 ## Block Editor