moving elements

contentManager.html

<div id="source">
  <!--  Source content here  -->
</div>

dev.html

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.4.0/css/bulma.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>

<!-- Destination Content -->
  <div class="container content">
    <div class="app"></div>
  </div>
<script>
$(function() {
  // Source Content
  var content = $("#source").contents()
  $(".app").replaceWith(content) 
  $("#source").remove()
})
</script>