Enable last-updated times in Starlight docs (#2720)

Author: delucis

docs/astro.config.mjs

@@ -41,6 +41,7 @@ export default defineConfig({
 				dark: '/src/assets/logo-dark.svg',
 				replacesTitle: true,
 			},
+			lastUpdated: true,
 			editLink: {
 				baseUrl: 'https://github.com/withastro/starlight/edit/main/docs/',
 			},