add motd to the server page

src/app/components/theme-toggle-button.tsx

@@ -0,0 +1,15 @@
+"use client";
+
+import { useTheme } from "next-themes";
+import { MoonIcon } from "./icon/moon-icon";
+import { SunIcon } from "./icon/sun-icon";
+
+export function ToggleThemeButton(): JSX.Element {
+  const { theme, setTheme } = useTheme();
+
+  return (
+    <button className="p-2 rounded-lg" onClick={() => setTheme(theme === "dark" ? "light" : "dark")}>
+      {theme === "dark" ? <SunIcon /> : <MoonIcon color="#000" />}
+    </button>
+  );
+}