Fix ScalaFX links - scalafx.org domain is no longer available

Author: WojciechMazur

_overviews/tutorials/scala-on-android.md

@@ -68,7 +68,7 @@ Make sure your `gcc` is at least version 6. [You can try following these steps](
 
 #### The example app
 
-if you reached this point and everything seems to work, it means you  probably should be able to compile and run the example app called [HelloScala](https://github.com/makingthematrix/scalaonandroid/tree/main/helloscala). HelloScala is based on [HelloGluon](https://github.com/gluonhq/gluon-samples/tree/master/HelloGluon) from [Gluon samples](https://github.com/gluonhq/gluon-samples). Gluon is a company that maintains JavaFX and provides libraries that give us a layer of abstraction between our code and the device — be it desktop, Android, or iOS.  It has some interesting implications: for example, you will see in the code that we check if we are  on the desktop instead of Android, because if yes then we need to  provide window size for our app. If we are on Android, we can just let  the app’s window take the whole screen. If you decide to write something more complex with this tech stack, you will quickly see that you can  use Gluon’s libraries and JavaFX (maybe together with [ScalaFX](http://www.scalafx.org/)) to achieve the same results other developers get by tinkering with  Android SDK, while you are writing code that can be easily re-used on  other platforms as well.
+if you reached this point and everything seems to work, it means you  probably should be able to compile and run the example app called [HelloScala](https://github.com/makingthematrix/scalaonandroid/tree/main/helloscala). HelloScala is based on [HelloGluon](https://github.com/gluonhq/gluon-samples/tree/master/HelloGluon) from [Gluon samples](https://github.com/gluonhq/gluon-samples). Gluon is a company that maintains JavaFX and provides libraries that give us a layer of abstraction between our code and the device — be it desktop, Android, or iOS.  It has some interesting implications: for example, you will see in the code that we check if we are  on the desktop instead of Android, because if yes then we need to  provide window size for our app. If we are on Android, we can just let  the app’s window take the whole screen. If you decide to write something more complex with this tech stack, you will quickly see that you can  use Gluon’s libraries and JavaFX (maybe together with [ScalaFX](https://scalafx.github.io/)) to achieve the same results other developers get by tinkering with  Android SDK, while you are writing code that can be easily re-used on  other platforms as well.
 
 In the `pom.xml` of HelloScala you will find a list of plugins and dependencies our example app uses. Let’s take a look at some of them.
 
@@ -136,7 +136,7 @@ If you managed to build one of the  example apps and want to code something more
 - Install [Scene Builder](https://gluonhq.com/products/scene-builder/) and learn how to build GUI with it. Apart from the docs, you can find a lot of tutorials about it on YouTube.
 - Look through [Gluon’s documentation of Glisten and Attach](https://docs.gluonhq.com/) to learn how to make your app look better on a mobile device, and how to get access to your device’s features.
 - Download an example from [Gluon’s list of samples](https://docs.gluonhq.com/) and rewrite it to Scala. And when you do, let me know! 
-- Look into [ScalaFX](http://www.scalafx.org/) — a more declarative, Scala-idiomatic wrapper over JavaFX.
+- Look into [ScalaFX](https://scalafx.github.io/) — a more declarative, Scala-idiomatic wrapper over JavaFX.
 - Download some other examples from [the “Scala on Android” repository on GitHub](https://github.com/makingthematrix/scalaonandroid). Contact me, if you write an example app of your own and want me to include it.
 - Join us on the official Scala discord — we have a [#scala-android channel](https://discord.gg/UuDawpq7) there.
 - There is also an [#android channel](https://discord.gg/XHMt6Yq4) on the “Learning Scala” discord.