jumpstart/app/views/shared/_navbar.html.erb

<nav class="navbar navbar-toggleable-md navbar-light bg-faded">
  <div class="container">
    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <%= link_to "Spark", root_path, class: "navbar-brand" %>

    <div class="collapse navbar-collapse" id="navbarSupportedContent">
      <ul class="navbar-nav mr-auto mt-2 mt-md-0">
      </ul>

      <ul class="navbar-nav">
        <li class="nav-item"><%= link_to "What's New", announcements_path, class: "nav-link #{unread_announcements(current_user)}" %></li>
        <% if user_signed_in? %>
          <li class="nav-item">
            <a class="nav-link" href="javascript:void(0)" data-uv-lightbox="classic_widget" data-uv-mode="full" data-uv-primary-color="#3aa2e3" data-uv-link-color="#56b68b" data-uv-default-mode="support" data-uv-forum-id="259979">Support</a>
          </li>
          <li class="nav-item"><%= link_to "Account", edit_user_registration_path, class: "nav-link" %></li>
          <li class="nav-item"><%= link_to "Logout", destroy_user_session_path, method: :delete, class: "nav-link" %></li>
        <% else %>
          <li class="nav-item"><%= link_to "Sign Up", new_user_registration_path, class: "nav-link" %></li>
          <li class="nav-item"><%= link_to "Login", new_user_session_path, class: "nav-link" %></li>
        <% end %>
      </ul>
    </div>
  </div>
</nav>