Fixed 'Sources' url

Author: dmytrotsko

src/templates/index.html

@@ -51,7 +51,7 @@
             </li>
 
             <li class="nav-item">
-                <a class="nav-link" href="#">
+                <a class="nav-link" href="{% url 'datasources' %}">
                   <i class="ri-stack-line"></i>
                   <span>Sources</span>
                 </a>