restructures templates

templates/download_results.html

@@ -1,5 +1,6 @@
 
-{% include "header.html" %}
+{% extends 'base.html' %}
+{% block content %}
         <section class="container-fluid d-flex justify-content-center">
             <div class="container-md my-5 mx-2 shadow-lg p-4 ">
                 <div class="container-sm">
@@ -90,4 +91,4 @@
          {{ bootstrap.load_js() }}
         <script src="{{url_for('.static', filename='download_results.js')}}"></script>
     {% endblock %}
-    {% include "footer.html" %}
+{% endblock content %}