docs(getting-started): update toolkit architecture guide

- Replace reference guide link with a direct link to the Hosting Packages for Customization page

Author: fulleni

src/content/docs/getting-started/toolkit-architecture.mdx

@@ -55,5 +55,5 @@ dependencies:
 ```
 
 <Aside type="tip">
-To truly customize the toolkit, you will need to host these packages in your own private repositories and update this `pubspec.yaml` file to point to your versions. The next guide will walk you through this essential process.
+To truly customize the toolkit, you will need to host these packages in your own private repositories and update this `pubspec.yaml` file to point to your versions. see the [Hosting Packages for Customization](/docs/customization/hosting-packages-for-customization/) guide.
 </Aside>