refactor: move components to sub dir

src/components/CurrentYear.tsx

@@ -0,0 +1,22 @@
+import { useEffect, useState } from 'react';
+
+// Update every half hour
+const TIMER_UPDATE_INTERVAL = 30 * 60 * 1000;
+
+const getCurrentYear = () => new Date().getFullYear();
+
+export function CurrentYear() {
+  const [year, setYear] = useState(getCurrentYear);
+
+  useEffect(() => {
+    const updateTime = () => setYear(getCurrentYear);
+    updateTime();
+
+    const timer = setInterval(updateTime, TIMER_UPDATE_INTERVAL);
+    return () => {
+      clearInterval(timer);
+    };
+  }, []);
+
+  return <>{year}</>;
+}