Changed link to template.xlsx

Point to a local template

cern_caimira/src/cern_caimira/apps/templates/base/calculator.form.html.j2

@@ -324,7 +324,7 @@
             <div class="modal-body">    
               <div class="d-flex d-row justify-content-between">
                 <h5 class="mt-auto mb-auto">Upload a valid data file (.xls or .xlsx):</h5>
-                <a class="btn btn-primary btn-sm" href="https://caimira-resources.web.cern.ch/CO2_template.xlsx">Download template</a>
+                <a class="btn btn-primary btn-sm" href="{{ get_url('/static/resources') }}/CO2_template.xlsx">Download template</a>
               </div>
               <div class="d-flex">
                 <p>You may use the provided template and fill in the values.</p>