UX: don't show crawler navigation in print view (#6551)

* UX: adds CSS classes to crawler navigation links

* UX: hide crawler navigation in print view

app/views/layouts/crawler.html.erb

@@ -28,14 +28,14 @@
       <%= yield %>
     </div>
     <footer class="container">
-      <nav itemscope itemtype='http://schema.org/SiteNavigationElement'>
+      <nav class='crawler-nav' itemscope itemtype='http://schema.org/SiteNavigationElement'>
         <a href='<%= path "/" %>'><%= t 'home_title' %></a>
         <%= link_to t('js.filters.categories.title'), path("/categories") %>
         <%= link_to t('guidelines_topic.title'), path("/guidelines") %>
         <%= link_to t('tos_topic.title'), path("/tos") %>
         <%= link_to t('privacy_topic.title'), path("/privacy") %>
       </nav>
-      <p><%= t 'powered_by_html' %></p>
+      <p class='powered-by-link'><%= t 'powered_by_html' %></p>
     </footer>
     <%= theme_lookup("body_tag") %>
   </body>

app/views/topics/show.html.erb

@@ -106,9 +106,15 @@
   <% content_for :after_body do %>
       <style media="print">
         /* For readability */
-        a, a:visited {
+        a,
+        a:visited {
           color: #0088cc !important;
         }
+        /* hide crawler nav in print view */
+        .crawler-nav,
+        .powered-by-link {
+          display: none;
+        }
       </style>
       <%= preload_script('print-page') %>
   <% end %>