refactor: use metadata export for seo

app/about/page.tsx

@@ -2,6 +2,9 @@ import { Authors, allAuthors } from 'contentlayer/generated'
 import { Mdx } from '@/components/MDXComponents'
 import AuthorLayout from '@/layouts/AuthorLayout'
 import { coreContent } from 'pliny/utils/contentlayer'
+import { genPageMetadata } from 'app/seo'
+
+export const metadata = genPageMetadata({ title: 'About' })
 
 export default function Page() {
   const author = allAuthors.find((p) => p.slug === 'default') as Authors