Patch up links to missing App store page

The developer document contains links to an `app-distribution.md` document
that doesn't exist. Point to the legacy canterbury documentation for now.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

content/developer/_index.md

@@ -15,7 +15,7 @@ The SDK is a linux virtual machine running a standard desktop environment on top
 * **Questions?** Read the [FAQ]( {{< ref "faq.md" >}} ).
 * **Ready to start development?** [Install the SDK]( {{< ref "install.md" >}} ).
 * **Want to create or update Apertis apps?**  Find out [What's new in the latest version of Apertis]( {{< ref "#whats-new-in-this-version" >}} ) or use the [API quick links]( {{< ref "#apertis-api-quick-links" >}} ) below.
-* **Ready to distribute your app?**  Continue on to [Distribution]( {{< ref "app-distribution.md" >}} ).
+* **Ready to distribute your app?**  Continue on to [Distribution]( {{< ref "canterbury-legacy-application-framework.md" >}} ).
 
 ## Support
 

content/developer/faq.md

@@ -37,4 +37,4 @@ A: Open a new task in the [Apertis Phabricator](https://phabricator.apertis.org/
 A: Open a new task in the [Apertis Phabricator](https://phabricator.apertis.org/maniphest/task/edit/form/3/).  
 
 #### Q: How do I distribute my application for Apertis?
-A: Distributing Apps for Apertis is covered in the [Distributing]( {{< ref "app-distribution.md" >}} ) section of this guide.
+A: Distributing Apps for Apertis is covered in the [Distributing]( {{< ref "canterbury-legacy-application-framework.md" >}} ) section of this guide.

content/developer/licensing.md

@@ -34,4 +34,4 @@ If you use a Free software license, you will need to follow the guidelines provi
      */
 ```
 
-The license you choose will not affect your ability to [distribute the application]( {{< ref "app-distribution.md" >}} ) through the Apertis app store.
+The license you choose will not affect your ability to [distribute the application]( {{< ref "canterbury-legacy-application-framework.md" >}} ) through the Apertis app store.