replaced controllers with handlers & unit tests

Signed-off-by: MarioRadu <[email protected]>

Author: MarioRadu

src/App/templates/error/404.html.twig

@@ -11,7 +11,7 @@
             <h1>404</h1>
             <p class="text-dark">
                 You are looking for something that doesn't exist or may have moved. Check out one of the links on this page
-                or head back to <a class="text-dark" href="{{ path('app.index') }}">Home</a>.
+                or head back to <a class="text-dark" href="{{ path('app::index') }}">Home</a>.
             </p>
         </div>
     </div>