Added meta to layouts

src/lib/site/meta.ts

@@ -0,0 +1,18 @@
+import type { Article, Page, Routed } from './types'
+
+export type Meta = {
+  title: string
+  description?: string
+  image?: string
+  noindex: boolean
+}
+
+const cover = (node: Routed) =>
+  node.collection === 'articles' ? (node as Article).summary.cover.image : null
+
+export const metaOf = (node: Article | Page): Meta => ({
+  title: node.title,
+  description: node.summary.excerpt || undefined,
+  image: cover(node) ?? undefined,
+  noindex: node.noindex,
+})