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.

.prettierrc.mjs

@@ -30,7 +30,7 @@ export default {
 		},
 	],
 	plugins: ["prettier-plugin-astro"],
-	printWidth: 180,
+	printWidth: 256,
 	proseWrap: "never",
 	quoteProps: "consistent",
 	requirePragma: false,