refactor(starter): upgrade to new version of gatsby

internal/gatsby/queries/metadata-query.ts

@@ -0,0 +1,23 @@
+import { CreatePagesArgs } from "gatsby";
+
+interface MetadataQueryResult {
+  site: {
+    siteMetadata: {
+      postsLimit?: number;
+    };
+  };
+}
+
+const metadataQuery = async (graphql: CreatePagesArgs["graphql"]) => {
+  const result = await graphql<MetadataQueryResult>(`
+    query SiteMetaData {
+      site {
+        postsLimit
+      }
+    }
+  `);
+
+  return result?.data?.site.siteMetadata ?? {};
+};
+
+export default metadataQuery;