docs: unregister service worker

docs/public/manifest.webmanifest

@@ -0,0 +1,9 @@
+{
+  "name": "Cropper.js",
+  "short_name": "Cropper.js",
+  "description": "JavaScript image cropper.",
+  "start_url": "/cropperjs/v2/index.html",
+  "display": "standalone",
+  "background_color": "#fff",
+  "theme_color": "#39f"
+}

docs/public/service-worker.js

@@ -0,0 +1,13 @@
+if ('serviceWorker' in navigator) {
+  self.addEventListener('install', () => {
+    self.skipWaiting();
+  });
+  self.addEventListener('activate', (event) => {
+    event.waitUntil(
+      caches.keys()
+        .then((keys) => Promise.all(keys.map((key) => caches.delete(key))))
+        .then(() => navigator.serviceWorker.getRegistrations())
+        .then((registrations) => Promise.all(registrations.map((registration) => registration.unregister())))
+    );
+  });
+}