Delete _navbar.html

App/templates/includes/_navbar.html

-<nav class="navbar navbar-default">
-      <div class="container">
-        <div class="navbar-header">
-          <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
-            <span class="sr-only">Toggle navigation</span>
-            <span class="icon-bar"></span>
-            <span class="icon-bar"></span>
-            <span class="icon-bar"></span>
-          </button>
-          <a class="navbar-brand" href="#">MyFlaskApp</a>
-        </div>
-        <div id="navbar" class="collapse navbar-collapse">
-          <ul class="nav navbar-nav">
-            <li><a href="/">Home</a></li>
-            <li><a href="/about">About</a></li>
-            <li><a href="/articles">Articles</a></li>
-          </ul>
-
-          <ul class="nav navbar-nav navbar-right">
-            {% if session.logged_in %}
-              <li><a href="/dashboard">Dashboard</a></li>
-              <li><a href="/logout">Logout</a></li>
-            {% else %}
-              <li><a href="/register">Register</a></li>
-              <li><a href="/login">Login</a></li>
-            {% endif %}
-
-          </ul>
-        </div><!--/.nav-collapse -->
-      </div>
-    </nav>