feat: Example for Sailfish template engine (#528)

Co-authored-by: aaverichev <Aleksandr.Averichev@hermesrussia.ru>
Co-authored-by: Rob Ede <robjtede@icloud.com>

template_engines/handlebars/static/templates/index.html

@@ -9,4 +9,4 @@
     <h1>{{name}} example</h1>
     <p>This is an example of how to use {{name}} with Actix-Web.</p>
 </body>
-</html>
+</html>

template_engines/handlebars/static/templates/user.html

@@ -9,4 +9,4 @@
     <h1>Welcome back, {{user}}</h1>
     <p>Here's your {{data}}.</p>
 </body>
-</html>
+</html>