Remove appdev-hello-world

Beyond showing the user how to load and build a project with eclipse
(which is rather basic and will surely be covered in generic Eclipse
documentation), this document shows the user how to [un]install the
application using the now defunct Apertis plugin. Since this is no longer
available, delete this page.

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

content/developer/appdev-hello-world.md

-+++
-short-description = "How to build your first application"
-license = "CC-BY-SAv4.0"
-title = "Application Development: Hello World"
-weight = 100
-aliases = [ "/old-developer/latest/appdev-hello-world.html", "/old-developer/v2019/appdev-hello-world.html", "/old-developer/v2020/appdev-hello-world.html", "/old-developer/v2021pre/appdev-hello-world.html", "/old-developer/v2022dev0/appdev-hello-world.html",]
-outputs = [ "html", "pdf-in",]
-date = "2016-04-22"
-+++
-
-The SDK comes with the Eclipse IDE installed, which the application developers can use to import, build and test any sample application. The imported sample application acts as a reference and further additions and modifications can be made to it.
-
-Here is a diagram outlining the project configuration process:
-
-![](/images/image3.png)
-
-These are steps to be followed to import a sample application into the workspace:
-
-* Open the Eclipse IDE by double clicking on this icon on the desktop of your SDK:
-
-    ![](/images/image4.png)
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-* In Eclipse IDE select **Menu**→**File**→**Import**. You will see a dialog like the one below:
-
-    ![](/images/image5.png)
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-* Select **General**→**Existing Projects into Workspace**.  Click **Next**. Select one of the subfolders of the `/home/user/sample-applications` directory. See the dialog below for details.
-
-    ![](/images/image6.png)
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-* Click on **Finish**, the sample application will be imported and configuration will start automatically as shown below (check the debugs in console).
-
-    ![](/images/image7.png)
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-* To build the project, right click on the project and select **Build Project**.
-
-    ![](/images/image8.png)
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-* The project should build without any errors:
-
-    ![](/images/image9.png)
-
-### Install via Eclipse
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-* After successful build of the project, right click on the project and select **Install (Native)** option. The selected project will be installed on the simulator.
-
-    ![](/images/image10.png)
-
-### Uninstalling code examples via Eclipse
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-To uninstall the code examples via Eclipse follow the below steps:
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-  * Right click on the project which you want to uninstall and select Uninstall (Native).
-  ![](/images/image11.png)
-
-### Next
-
-- **Want to find out more about the technologies available to applications in the Apertis environment?** Read about [Apertis technologies]( {{< ref "apis-and-services.md" >}} ).
-- **Ready to use the Apertis Development Environment?** Continue on to building and debugging with [the ADE tool]( {{< ref "appdev-ade.md" >}} )