Serve both the controller and the display on the same endpoint

controller/controller.html

@@ -4,8 +4,8 @@
     <meta charset="UTF-8">
     <title>The Fancy N</title>
     <link href="https://fonts.googleapis.com/css?family=Roboto+Slab&display=swap" rel="stylesheet">
-    <link rel="stylesheet" href="./main.css">
-    <script src="controller.js"></script>
+    <link rel="stylesheet" href="/controller/main.css">
+    <script src="/controller/controller.js"></script>
     <meta name="viewport" content="width=300px, initial-scale=1">
     <style>
         body {

controller/controller.js

@@ -52,7 +52,7 @@ document.addEventListener("touchmove", (e) => {
 });
 
 function sendNudge(x, y) {
-    fetch("/", {
+    fetch("", {
         method: "POST",
         headers: {"Content-Type": "application/json"},
         referrer: "no-referrer",