Improve SEO metadata and structured data

data/site-config.ts

@@ -0,0 +1,8 @@
+const FALLBACK_SITE_URL = "https://grace-salamoun-architect.vercel.app";
+
+export const siteName = "Grace Butrus Salmoun Portfolio";
+export const siteUrl = (process.env.NEXT_PUBLIC_SITE_URL ?? FALLBACK_SITE_URL).replace(/\/+$/, "");
+
+export function absoluteUrl(path = "/") {
+  return new URL(path, `${siteUrl}/`).toString();
+}