Correct link text and URLs in quick links in Introduction documentati…

…on, thanks and close pagekit#65

getting-started/introduction.md

@@ -8,4 +8,4 @@ Depending on your goals with Pagekit you might want to read only pieces of the d
 2. Learn how to use the Pagekit [user interface](../user-interface/dashboard.md).
 3. To get started as a developer, learn [how to create an extension](../tutorials/extension.md) and [how to build a theme](../tutorials/theme.md).
 4. For a complete video tutorial on building an extension, watch [the screencast about an example extension](../tutorials/extension.md).
-5. For more fundamental developer topics, read up on e.g. [packages](../developer/packages.md), [modules](../developer/packages.md) and [packages](../developer/routing.md).
+5. For more fundamental developer topics, read up on e.g. [packages](../developer/packages.md), [modules](../developer/modules.md) and [routing](../developer/routing.md).