title: Add meta tag to <head>
body: <p>I want to add meta tags to my site.</p>
  <p>I added this code in my THEME.theme file and cleared the cache.</p>
  <pre class="lang-php prettyprint-override"><code>/**
   * Implements hook_page_attachments_alter().
   *
   * Include meta tags and fonts using attachment method.
   */
  function bartik_page_attachments_alter(array &amp;$page) {
    $font_attributes = array(
      'rel' =&gt; 'stylesheet',
      'type' =&gt; 'text/css',
      'href' =&gt; 'https://fonts.googleapis.com/css?family=Lato:400,100,100italic,300,300italic,400italic,700',
    );
  
    $page['#attached']['html_head_link'][] = array($font_attributes);
  
    $rendering_meta = array(
      '#type' =&gt; 'html_tag',
      '#tag' =&gt; 'meta',
      '#attributes' =&gt; array(
        'name' =&gt; 'SKYPE_TOOLBAR',
        'content' =&gt; 'SKYPE_TOOLBAR_PARSER_COMPATIBLE',
      ),
    );
  
    $page['#attached']['html_head'][] = [$rendering_meta, 'rendering_meta'];
  }
  </code></pre>
  <p>This code just attaches the meta tag to the login page.</p>
  <p>What should I do to add the meta tag to all the site pages?</p>