Make CSV import a feature that can be turned on / off.

resources/twig/partials/menu-sidebar.twig

@@ -123,9 +123,11 @@
             <li class="{{ activeRoutePartial('currency') }}">
                 <a class="{{ activeRoutePartial('currency') }}" href="{{ route('currency.index') }}"><i class="fa fa-usd fa-fw"></i> {{ 'currencies'|_ }}</a>
             </li>
+            {% if Config.get('firefly.csv_import_enabled') %}
             <li class="{{ activeRoutePartial('csv') }}">
                 <a href="{{ route('csv.index') }}"><i class="fa fa-file-text-o fa-fw"></i> {{ 'csv_import'|_ }}</a>
             </li>
+            {% endif %}
         </ul>