migrate PWA script injection

Oqtane.Server/Pages/_Host.cshtml

@@ -8,10 +8,6 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <base href="~/" />
-	@if (!string.IsNullOrEmpty(Model.PWAScript))
-	{
-		<link id="app-manifest" rel="manifest" />
-	}
     <script src="js/app.js"></script>
     <script src="js/loadjs.min.js"></script>
     <link rel="stylesheet" href="css/app.css" />
@@ -52,10 +48,6 @@
 		{
 			@Html.Raw(Model.ReconnectScript)
 		}
-		@if (!string.IsNullOrEmpty(Model.PWAScript))
-		{
-			@Html.Raw(Model.PWAScript)
-		}
 		@Html.Raw(Model.BodyResources)
         <component type="typeof(Oqtane.Body)" render-mode="@((RenderMode)Enum.Parse(typeof(RenderMode), Model.RenderMode, true))" />
     }