refactor: update schema handling and improve SEO metadata

- Changed schema type from WithContext<Thing> to Thing[] in Head, BaseLayout, and JsonLd components for better flexibility.
- Added optional robots meta tag to Head component.
- Updated JSON-LD generation in JsonLd component to include a structured payload.
- Enhanced page and blog schemas to support breadcrumb and person schemas for improved SEO.
- Introduced new utility schemas for website and person to streamline schema generation.
- Refactored existing schemas to align with the new structure and ensure consistency across components.

1 files changed, 28 insertions, 18 deletions

diff --git a/src/utils/schemas/blogSchema.ts b/src/utils/schemas/blogSchema.ts
index 196f037..ff3ce65 100644
--- a/src/utils/schemas/blogSchema.ts
+++ b/src/utils/schemas/blogSchema.ts
@@ -1,26 +1,36 @@
-import type { WithContext, CollectionPage } from "schema-dts";
+import type { CollectionPage } from "schema-dts";
 import type { CollectionEntry } from "astro:content";
+import { websiteId } from "./ids";
 
 export type BlogSchemaParams = {
+	readonly description: string;
+	readonly lang: string;
 	readonly posts: CollectionEntry<"blog">[];
 	readonly siteUrl: string;
 	readonly title: string;
 };
 
-export default ({ siteUrl, title, posts }: BlogSchemaParams): WithContext<CollectionPage> => ({
-	"@context": "https://schema.org",
-	"@type": "CollectionPage",
-	"url": new URL("/blog/", siteUrl).toString(),
-	"name": title,
-	"mainEntity": {
-		"@type": "ItemList",
-		"itemListOrder": "https://schema.org/ItemListOrderDescending",
-		"numberOfItems": posts.length,
-		"itemListElement": posts.map((post, index) => ({
-			"@type": "ListItem",
-			"position": index + 1,
-			"url": new URL(`/blog/${post.id}`, siteUrl).toString(),
-			"name": post.data.title,
-		})),
-	},
-});
+export default ({ siteUrl, title, description, lang, posts }: BlogSchemaParams): CollectionPage => {
+	const url = new URL("/blog/", siteUrl).toString();
+
+	return {
+		"@type": "CollectionPage",
+		"@id": url,
+		"url": url,
+		"name": title,
+		"description": description,
+		"inLanguage": lang,
+		"isPartOf": { "@id": websiteId(siteUrl) },
+		"mainEntity": {
+			"@type": "ItemList",
+			"itemListOrder": "https://schema.org/ItemListOrderDescending",
+			"numberOfItems": posts.length,
+			"itemListElement": posts.map((post, index) => ({
+				"@type": "ListItem",
+				"position": index + 1,
+				"url": new URL(`/blog/${post.id}`, siteUrl).toString(),
+				"name": post.data.title,
+			})),
+		},
+	};
+};