title: remove li class & id for menu items and pages list
body: <p>Example of WordPress default CSS class output:</p>
  
  <pre><code>&lt;li id="menu-item-55" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-55"&gt;
  
  &lt;li class="page_item page-item-37"&gt;
  </code></pre>
  
  <p>The menu and pages list item come with various own li <code>class</code> and <code>id</code>.</p>
  
  <p>How to remove them in <code>functions.php</code> file for the menu and for the pages list?</p>