Refactor application configuration; implement dynamic database URI setup based on environment variables for improved flexibility and maintainability

templates/index.html

@@ -25,6 +25,7 @@
             </div>
         </div>
         {% endif %}
+        {% if (datasets[0]['values'] | sum) > 0 %}
         <div class="col">
             <div class="card">
                 <div class="card-body">
@@ -33,6 +34,7 @@
                 </div>
             </div>
         </div>
+        {% endif %}
     </div>
 </div>
 {% endblock %}