refactor(starter): upgrade to new version of gatsby

internal/testing/__mocks__/author.ts

@@ -0,0 +1,8 @@
+import contacts from "./contacts";
+
+export default {
+  photo: "/static/photo.jpg",
+  bio: "Pellentesque odio nisi, euismod in, pharetra a, ultricies in, diam. Sed arcu.",
+  name: "John Doe",
+  contacts,
+};