move some non-post pages to mdx

components/YouTube/YouTube.module.css

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+.wrapper :global(lite-youtube) {
+  margin: 0 auto;
+}

components/YouTube/YouTube.tsx

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+import { YouTubeEmbed } from "@next/third-parties/google";
+
+import styles from "./YouTube.module.css";
+
+export type YouTubeProps = {
+  id: string;
+};
+
+const YouTube = ({ id }: YouTubeProps) => {
+  return (
+    <div className={styles.wrapper}>
+      <YouTubeEmbed videoid={id} />
+    </div>
+  );
+};
+
+export default YouTube;

components/YouTube/index.ts

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+export * from "./YouTube";
+export { default } from "./YouTube";