Refactoring: vaccination

src/flask_covid19/blueprints/data_owid/templates/owid/continent/all/owid_continent_all_table.html

@@ -16,6 +16,11 @@
                         </tr>
                     {% endfor %}
                     </tbody>
+                <tfoot>
+                    <tr>
+                        <th scope="col">continent</th>
+                    </tr>
+                </tfoot>
                 </table>
                 </div>