New settings pages (XAML) and improvements to ShellPage. Added more styles for typical margins and textblocks (#1735)

src/core/Microsoft.PowerToys.Settings.UI/Styles/TextBlock.xaml

@@ -18,4 +18,9 @@
         <Setter Property="TextWrapping" Value="Wrap" />
     </Style>
 
+
+    <Style x:Key="SettingsGroupTitleStyle" TargetType="TextBlock" BasedOn="{StaticResource SubtitleTextBlockStyle}">
+        <Setter Property="Margin" Value="0,34,0,8" />
+    </Style>
+
 </ResourceDictionary>