fix(docs): use blog post header image as OG image instead of default

Co-authored-by: himself65 <14026360+himself65@users.noreply.github.com>

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

@@ -272,8 +272,20 @@ export async function generateMetadata({
 	}
 	const page = blogs.getPage(slug);
 	if (!page) return notFound();
-	const { title, description } = page.data;
-	return { title, description };
+	const { title, description, image } = page.data;
+	return {
+		title,
+		description,
+		...(image && {
+			openGraph: {
+				images: [image],
+			},
+			twitter: {
+				card: "summary_large_image" as const,
+				images: [image],
+			},
+		}),
+	};
 }
 
 export function generateStaticParams() {