Move all code to old/ to prepare for Nuxt rewrite

public/robots.txt

@@ -1,2 +0,0 @@
-User-Agent: *
-Disallow: /

public/sw.js

@@ -1,25 +0,0 @@
-self.addEventListener("push", function (event) {
-	console.log(event);
-	if (!event.data)
-		return;
-
-	const payload = event.data.json();
-	const { body, icon, image, badge, url, title } = payload;
-	const notificationTitle = title ?? "No title";
-	const notificationOptions = {
-		body,
-		icon,
-		image,
-		data: {
-			url,
-		},
-		badge,
-	};
-
-	event.waitUntil(
-		self.registration.showNotification(notificationTitle, notificationOptions)
-			.then(() => {
-				console.log("Web push delivered");
-			})
-	);
-});