[Docs Site] Pass changelog description to StarlightPage

Author: KianNH

src/pages/changelog/[...slug].astro

@@ -31,6 +31,7 @@ const { Content, headings } = await render(note);
 const props = {
 	frontmatter: {
 		title: note.data.title,
+		description: note.data.description,
 		template: "splash",
 		noindex: note.data.hidden,
 	},