added link to about page in navbar

web/app/templates/base.html

           </button>
           <div class="collapse navbar-collapse" id="navbarSupportedContent">
             <ul class="navbar-nav">
+              <li class="nav-item">
+                  <a href="{{ url_for('main.about') }}" class="nav-link">
+                      About
+                  </a>
+              </li>
             <li class="nav-item">
                 <a href="{{ url_for('tool.get_tools') }}" class="nav-link">
                     Tools
                 </a>
             </li>
             {% endif %}
-            <li class="nav-item">
-                <a href="{{ url_for('main.test') }}" class="nav-link">
-                    Test
-                </a>
-            </li>
             </ul>
           </div>
         </div>