Refactor server stuff

server/server.ts

@@ -0,0 +1,15 @@
+/// <reference lib="deno.ns" />
+
+export function startServer(
+	handler: Deno.ServeHandler,
+	hostname: string = "localhost",
+	port: number = 8042,
+): () => Promise<void> {
+	const ac = new AbortController();
+	const server = Deno.serve({ hostname, port, signal: ac.signal }, handler);
+
+	return () => {
+		ac.abort();
+		return server.finished;
+	};
+}