Add more structured metadata

src/helpers/useSiteMetadata.js

@@ -0,0 +1,37 @@
+import { useStaticQuery, graphql } from 'gatsby';
+
+const useSiteMetadata = () => {
+  const { site } = useStaticQuery(
+  graphql`
+    query {
+    site {
+      siteMetadata {
+        title
+        keywords
+        author
+        siteUrl
+        payPalMail
+        contactEmail
+        contactPhone
+        mapsLink
+        contactTwitter
+        contactGitHub
+        contactMastodon
+        contactMastodonHref
+        givenName
+        familyName
+        birthDate
+        address
+        gender
+        height
+        nationality
+        sameAs
+      }
+    }
+    }
+  `,
+  );
+  return site.siteMetadata;
+};
+
+export default useSiteMetadata;