Implement login form in template and add support for flash messages via a toast.

app/templates/base.html.j2

@@ -93,7 +93,6 @@
       </div>
     </footer>
 
-    <!--JavaScript at end of body for optimized loading-->
     <script type="text/javascript" src="{{ url_for('static', filename='js/materialize.min.js') }}"></script>
     <script>
         M.AutoInit();
@@ -105,6 +104,9 @@
           document.getElementById("nav-settings"),
           {"alignment": "right", "constrainWidth": false, "coverTrigger": false}
         );
+        {% for message in get_flashed_messages() %}
+        M.toast({html: '{{ message }}'})
+        {% endfor %}
     </script>
   </body>
 </html>