refactor(starter): upgrade to new version of gatsby

internal/gatsby/types/edge.ts

@@ -0,0 +1,25 @@
+import { Node as GatsbyNode } from "gatsby";
+
+interface Frontmatter {
+  slug?: string;
+  template?: string;
+  category?: string;
+  tags?: Array<string>;
+}
+
+interface Fields {
+  slug?: string;
+  categorySlug?: string;
+  tagSlugs?: Array<string>;
+}
+
+interface Node extends GatsbyNode {
+  fields?: Fields;
+  frontmatter?: Frontmatter;
+}
+
+interface Edge {
+  node: Node;
+}
+
+export default Edge;

internal/gatsby/types/index.ts

@@ -0,0 +1 @@
+export type { default as Edge } from "./edge";