docs: add sw clearer

Author: posva

docs/public/service-worker.js

@@ -0,0 +1,15 @@
+// force clearing previous service worker
+self.addEventListener('install', function (e) {
+  self.skipWaiting()
+})
+
+self.addEventListener('activate', function (e) {
+  self.registration
+    .unregister()
+    .then(function () {
+      return self.clients.matchAll()
+    })
+    .then(function (clients) {
+      clients.forEach((client) => client.navigate(client.url))
+    })
+})