obdev/app/views/layouts/_navbar.html.erb

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <div class="container-fluid">
    <%= link_to 'Home', root_path, class: 'navbar-brand' %>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarNav">
      <ul class="navbar-nav ms-auto mb-2 mb-lg-0">
        <!-- Add links to model index pages here -->
        <li class="nav-item">
          <%= link_to 'Participants', participants_path, class: 'nav-link' %>
        </li>
        <li class="nav-item">
          <%= link_to 'Employers', employers_path, class: 'nav-link' %>
        </li>
        <li class="nav-item">
          <%= link_to 'Workers', workers_path, class: 'nav-link' %>
        </li>
        <li class="nav-item">
          <%= link_to 'Vendors', vendors_path, class: 'nav-link' %>
        </li>

        <!-- Authentication links -->
        <% if user_signed_in? %>
          <li class="nav-item">
            <%= link_to 'Sign Out', destroy_user_session_path, method: :delete, class: 'nav-link' %>
          </li>
        <% else %>
          <li class="nav-item">
            <%= link_to 'Sign In', new_user_session_path, class: 'nav-link' %>
          </li>
        <% end %>
      </ul>
    </div>
  </div>
</nav>