Replace old markdown and remove redundant events (#389)

* Remove redundant messages

* Replaced old markdown with preview.
Added nuget config to add preview feed

* Fix old extensions usage

* Scrollbar margin for the markdown.

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Co-authored-by: Burak Kaan Köse <bkaankose@outlook.com>

Wino.Mail/Views/WelcomePage.xaml

@@ -3,30 +3,19 @@
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:abstract="using:Wino.Views.Abstract"
-    xmlns:controls="using:Microsoft.Toolkit.Uwp.UI.Controls"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-    xmlns:local="using:Wino.Views"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:toolkitmd="using:CommunityToolkit.Labs.WinUI.MarkdownTextBlock"
     mc:Ignorable="d">
 
-    <Border
-        Margin="0,0,7,7"
-        Background="{ThemeResource WinoContentZoneBackgroud}"
-        BorderBrush="{StaticResource CardStrokeColorDefaultBrush}"
-        BorderThickness="1"
-        CornerRadius="7">
-        <Grid Padding="24">
+    <Border Style="{StaticResource PageRootBorderStyle}">
+        <Grid Padding="15">
             <ScrollViewer>
-                <controls:MarkdownTextBlock
-                    x:Name="MarkdownControl"
-                    Background="Transparent"
+                <toolkitmd:MarkdownTextBlock
+                    Margin="0,0,16,0"
                     CharacterSpacing="12"
+                    Config="{x:Bind _config, Mode=OneTime}"
                     FontSize="16"
-                    Header1FontSize="30"
-                    Header2FontSize="22"
-                    ImageStretch="UniformToFill"
-                    LinkClicked="HyperlinkClicked"
-                    ListBulletSpacing="10"
                     Text="{x:Bind ViewModel.CurrentVersionNotes, Mode=OneWay}" />
             </ScrollViewer>
         </Grid>