Riorganizzato slide e ottimizzato il loro caricamento

script.js

@@ -1,20 +1,38 @@
-var counter = 0;
+var counter = -1;
+var slides = [];
 
-async function reloadSlide() {
-  const req = await fetch(`./slide/${counter}.html`)
-  if(req.status != 200) return false;
-  container.innerHTML = await req.text();
-  return true;
+async function loadSlides()  {
+  var slidei = 1;
+  var sectioni = 1;
+
+  sectionloop: while(true) {
+    slidei = 1;
+    slideloop: while(true) {
+      const req = await fetch(`./slide/${sectioni}/${slidei}.html`);
+      if(req.status != 200) {
+        if(slidei == 1) break sectionloop;
+        break slideloop;
+      }
+      slides.push(await req.text());
+      slidei++;
+    }
+    sectioni++;
+  }
+  nextSlide();
 }
 
-async function nextSlide() {
-  counter++;
-  if(!await reloadSlide()) counter--;
+loadSlides();
+
+function nextSlide() {
+  if(counter >= slides.length - 1) return;
+
+  container.innerHTML = slides[++counter];
 }
 
-async function previousSlide() {
-  counter--;
-  if(!await reloadSlide()) counter++;
+function previousSlide() {
+  if(counter <= 0) return;
+
+  container.innerHTML = slides[--counter];
 }
 
 document.body.addEventListener('click', nextSlide); 
@@ -34,4 +52,3 @@ document.addEventListener(
   false,
 );
 
-nextSlide();