feat: add new post banner layout

app/blog/[...slug]/page.tsx

@@ -6,6 +6,7 @@ import { allBlogs, allAuthors } from 'contentlayer/generated'
 import type { Authors, Blog } from 'contentlayer/generated'
 import PostSimple from '@/layouts/PostSimple'
 import PostLayout from '@/layouts/PostLayout'
+import PostBanner from '@/layouts/PostBanner'
 import { Metadata } from 'next'
 import siteMetadata from '@/data/siteMetadata'
 
@@ -14,6 +15,7 @@ const defaultLayout = 'PostLayout'
 const layouts = {
   PostSimple,
   PostLayout,
+  PostBanner,
 }
 
 export async function generateMetadata({