Move images to public folder [SCI-8842]

app/views/layouts/application.html.erb

@@ -86,7 +86,7 @@
         <% if user_signed_in? && current_user.teams.blank? && !(activities_are_selected? || settings_are_selected?) %>
           <!-- If member of no teams -->
           <div id="no-teams-jumbotron" class="jumbotron">
-            <%= image_tag "not-part-of-any-team.png" %>
+            <%= image_tag "/images/not-part-of-any-team.png" %>
             <h2><%=t 'general.no_teams.title' %></h2>
             <p class="no-teams-info"><%=t 'general.no_teams.text' %></p>
           </div>

app/views/zip_exports/file_expired.html.erb

@@ -1,6 +1,6 @@
 <div class="container">
   <div class="jumbotron">
-    <%= image_tag "link-expired.png" %>
+    <%= image_tag('/images/no_search_results.png') %>
     <h2><%=t 'zip_export.expired_title' %></h2>
     <p><%=t 'zip_export.expired_description' %></p>
   </div>