chore: Set up Deno project with Docker, environment configuration, and basic server

deno/main.ts

@@ -0,0 +1,24 @@
+import "jsr:@std/dotenv/load";
+import { serveFile } from "jsr:@std/http/file-server";
+
+const PORT = Deno.env.get("PORT") || 8000;
+
+const handler = async (req: Request): Promise<Response> => {
+  const url = new URL(req.url);
+
+  if (url.pathname === "/") {
+    return await serveFile(req, "./public/index.html");
+  } else if (url.pathname === "/greet") {
+    const greeting = Deno.env.get("GREETING") || "Hello from Deno 2!";
+    return new Response(greeting);
+  } else {
+    return new Response("Not Found", { status: 404 });
+  }
+};
+
+// Error handling
+try {
+  Deno.serve({ port: Number(PORT) }, handler);
+} catch (err) {
+  console.error("Error starting the server:", err);
+}