feat(ShowEnvelope): render envelope message using Markdown parser

EnvelopeGenerator.Web/Views/Envelope/ShowEnvelope.cshtml

@@ -79,7 +79,7 @@
                 }
                 else
                 {
-                <h6>@($"{@envelope?.Message}")</h6>
+                <div id="envelope-message"></div>
                 }
                 <p>
                     <small class="text-body-secondary">
@@ -134,6 +134,8 @@
 @if (!isReadOnly)
 {
 <script nonce="@nonce">
+    document.getElementById('envelope-message').innerHTML = marked.parse('@(envelope?.Message)');
+
     document.getElementById('readonly-send').addEventListener('click', async () => {
         const receiverMail = document.getElementById('readonly-receiver-mail');
         const dateValid = document.getElementById('readonly-date-valid');

EnvelopeGenerator.Web/Views/Shared/_Layout.cshtml

@@ -49,6 +49,7 @@
     <script src="~/lib/bootstrap/dist/js/bootstrap.min.js"></script>
     <script src="~/lib/sweetalert2/sweetalert2.min.js"></script>
     <script src="~/lib/alertifyjs/alertify.min.js"></script>
+    <script src="~/lib/marked/marked.umd.min.js"></script>
     <script src="~/js/lazy.min.js" asp-append-version="true"></script>
     <script src="~/js/ui.min.js" asp-append-version="true"></script>
     <script src="~/js/annotation.js" asp-append-version="true"></script>