feat: add configuration and default image for blog posts

- Introduced a new configuration file to centralize author information and default image settings for blog posts.
- Added a default image path in the blog post configuration for improved content presentation.
- Updated blog post schema to utilize the new configuration for author details, enhancing structured data representation.

src/utils/schemas/blogPostSchema.ts

@@ -1,29 +1,33 @@
 import type { WithContext, BlogPosting } from "schema-dts";
+import { config } from "../../config";
 
 export type BlogPostSchemaParams = {
-	readonly author: string;
 	readonly dateModified: string;
 	readonly datePublished: string;
 	readonly description: string;
 	readonly isBasedOn?: string;
 	readonly lang: string;
+	readonly preview?: string;
 	readonly siteUrl: string;
 	readonly slug: string;
 	readonly title: string;
 };
 
-export default ({ siteUrl, slug, title, description, datePublished, dateModified, author, lang, isBasedOn }: BlogPostSchemaParams): WithContext<BlogPosting> => ({
+export default ({ siteUrl, slug, title, description, preview, datePublished, dateModified, lang, isBasedOn }: BlogPostSchemaParams): WithContext<BlogPosting> => ({
 	"@context": "https://schema.org",
 	"@type": "BlogPosting",
 	"url": new URL(`/blog/${slug}`, siteUrl).toString(),
 	"headline": title,
 	"description": description,
+	"image": new URL(preview ? preview : config.posts.defaultImage, siteUrl).toString(),
 	"datePublished": datePublished,
 	"dateModified": dateModified,
 	"inLanguage": lang,
 	"author": {
 		"@type": "Person",
-		"name": author,
+		"name": config.author.name,
+		"url": config.author.url,
+		"sameAs": config.author.sameAs,
 	},
 	"mainEntityOfPage": {
 		"@type": "WebPage",