feat: enhance accessibility and language support across components

- Updated various components to include `lang` attributes for improved accessibility and SEO.
- Introduced a new `env.d.ts` file to define environment variables for better type safety.
- Adjusted the print width in `.prettierrc.mjs` for improved code formatting.
- Streamlined the `Header`, `PostElement`, and `SocialLinks` components for better structure and clarity.
- Added language support to blog posts and updated the layout to reflect these changes.

src/components/Sections/LatestPosts.astro

@@ -26,7 +26,9 @@ const latestPosts = posts.slice(0, 5);
 		{
 			latestPosts.map((post) => (
 				<li>
-					<a href={`/blog/${post.slug}`}>{post.data.title}</a>
+					<a href={`/blog/${post.slug}`} lang={post.data.lang}>
+						{post.data.title}
+					</a>
 					<small>{dayjs(post.data.pubDate.toString()).format("MMMM DD, YYYY")}</small>
 				</li>
 			))