fix: use environment variable for API URL

frontend-plataforma-tutoriais/src/components/header/index.tsx

@@ -31,7 +31,7 @@ export default function Header() {
     const { getVideosSearch } = useGetVideosSearch();
     const { getWorkshopsSearch } = useGetWorkshopsSearch();
     /* const { getCurrentUser } = useGetCurrentUser(); */
-    const [role, setRole] = useState(0);
+    const [role, _setRole] = useState(0);
     const [videosWatched, setVideosWatched] = useState(0);
     const [videosCount, setVideosCount] = useState(0);