tidy up hyperlinks into a style

src/Avalonia.Dialogs/AboutAvaloniaDialog.xaml

@@ -40,6 +40,15 @@
       <Setter Property="Width" Value="750" />
       <Setter Property="Height" Value="700" />
     </Style>
+    <Style Selector="Button.Hyperlink">
+      <Setter Property="Background" Value="Transparent" />
+      <Setter Property="BorderThickness" Value="0" />
+      <Setter Property="Foreground" Value="#419df2" />
+      <Setter Property="Command" Value="{Binding OpenBrowser}" />
+      <Setter Property="Content" Value="{Binding $self.CommandParameter}" />
+      <Setter Property="HorizontalAlignment" Value="Center" />
+      <Setter Property="Cursor" Value="Hand" />
+    </Style>
   </Window.Styles>
   <Grid Background="#4A255D">
     <Canvas>
@@ -73,14 +82,15 @@
         <TextBlock Text="Development Build" Margin="0,-10,0,0" FontSize="15" Foreground="White" />
       </StackPanel>
     </StackPanel>
-    <StackPanel HorizontalAlignment="Stretch" VerticalAlignment="Center" Spacing="20" Margin="0 60 0 0">
+    <StackPanel HorizontalAlignment="Stretch" VerticalAlignment="Center" Spacing="20" Margin="10 60 10 0">
       <TextBlock Text="This product is built with the Avalonia cross platform UI Framework." TextWrapping="Wrap" HorizontalAlignment="Center" />
-      <Button Cursor="Hand" Background="Transparent" BorderThickness="0" Foreground="#419df2" Command="{Binding OpenGithub}" Content="https://github.com/AvaloniaUI/Avalonia" HorizontalAlignment="Center" />
-      <Button Cursor="Hand" Background="Transparent" BorderThickness="0" Foreground="#419df2" Command="{Binding OpenWebsite}" Content="https://www.avaloniaui.net/" HorizontalAlignment="Center" />
-    </StackPanel>
+      <TextBlock Text="Avalonia is made possible by the generous support of it's contributors and community." TextWrapping="Wrap" HorizontalAlignment="Center" />
+      <Button Classes="Hyperlink" CommandParameter="https://github.com/AvaloniaUI/Avalonia/"  />
+      <Button Classes="Hyperlink" CommandParameter="https://avaloniaui.net/"  />
+    </StackPanel> 
     <StackPanel VerticalAlignment="Bottom">
       <TextBlock Text="© 2019 AvaloniaUI OÜ (14839404)" TextWrapping="Wrap" HorizontalAlignment="Center" />
       <TextBlock Text="" HorizontalAlignment="Right" Margin="5" FontSize="15" />
     </StackPanel>
   </Grid>
-</Window>
+</Window>

src/Avalonia.Dialogs/AboutAvaloniaDialog.xaml.cs

@@ -13,21 +13,10 @@ namespace Avalonia.Dialogs
         public AboutAvaloniaDialog()
         {
             AvaloniaXamlLoader.Load(this);
-
             DataContext = this;
         }
-
-        public void OpenGithub()
-        {
-            OpenBrowser("https://github.com/AvaloniaUI/Avalonia/");
-        }
-
-        public void OpenWebsite()
-        {
-            OpenBrowser("https://avaloniaui.net/");
-        }
-
-        private static void OpenBrowser(string url)
+ 
+        public static void OpenBrowser(string url)
         {
             if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
             {