Add new pages and improve blog content display functionality

Implement new routes for articles, categories, and individual articles. Update the UI to display articles with improved content rendering, including safe HTML and media embeds. Refactor storage to use a database and add image upload capabilities.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 413891e8-d784-4bea-b9f5-91a5a68316b4
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: b96b221e-0ed6-418f-80df-e4670bf5ba4b
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/f209e72a-0939-48fa-84fc-57854de71967/413891e8-d784-4bea-b9f5-91a5a68316b4/cftwqyT
Replit-Helium-Checkpoint-Created: true

server/db.ts

@@ -0,0 +1,10 @@
+import { drizzle } from "drizzle-orm/node-postgres";
+import pg from "pg";
+import * as schema from "@shared/schema";
+
+if (!process.env.DATABASE_URL) {
+  throw new Error("DATABASE_URL must be set.");
+}
+
+const pool = new pg.Pool({ connectionString: process.env.DATABASE_URL });
+export const db = drizzle(pool, { schema });