added blog post page, reverted back to flex blog landing, added types

frontend/types/index.ts

@@ -0,0 +1,17 @@
+export type Post = {
+  post_id: number;
+  author_id: number;
+  first_name: string;
+  last_name: string;
+  title: string;
+  body: string;
+  created_at: string;
+};
+
+export type Author = {
+  author_id: number;
+  first_name: string;
+  last_name: string;
+  bio: string;
+  image?: string;
+};