[OOBE] Bolded shortcuts / instructions (#10574)

* Colorpicker keys

* Key visuals added

* Added highlighted text

* Undo comment

Co-authored-by: Niels Laute <niels9001@hotmail.com>

src/settings-ui/Microsoft.PowerToys.Settings.UI/Styles/TextBlock.xaml

@@ -31,6 +31,7 @@
 
     <Style x:Key="OobeSubtitleStyle" TargetType="TextBlock">
         <Setter Property="FontWeight" Value="SemiBold"/>
+        <Setter Property="FontSize" Value="16" />
         <Setter Property="Margin" Value="0,16,0,0" />
     </Style>
 </ResourceDictionary>