use .env api url

src/pages/Home/components/Calendar/calendar.jsx

@@ -133,7 +133,7 @@ function Calendar() {
                         variant={"primary"}
                         onClick={() => {
                             window.location.href =
-                                `http://localhost/api/export/ics/${user.id}`;
+                                `${import.meta.env.VITE_API_URL}/api/export/ics/${user.id}`;
                         }}
                 >
                     Exporter mon agenda