Make date optional in props

apps/kb/src/layouts/GuideLayout.astro

@@ -10,7 +10,7 @@ interface Props {
 	description?: string
 	topics?: Topic[]
 	github_url?: string
-	date: string
+	date?: string
 }
 
 const { title, description, topics = [], github_url, date } = Astro.props