add webpack for front end builds and serve the assets from backend

lib/static/service-worker.js

@@ -0,0 +1,31 @@
+// Worker v14
+
+self.addEventListener('install', (event) => {
+  event.waitUntil(
+    caches.open('fb-to-ical').then((cache) => {
+      return cache.addAll([
+        '/',
+        '/favicon.ico',
+        '/scripts.js?6',
+        '/style.css?9',
+        '/about?3',
+        '/icon-512.png',
+      ])
+    })
+  )
+})
+
+self.addEventListener('fetch', (event) => {
+  event.respondWith(
+    caches.match(event.request)
+      .then((response) => {
+        return response || fetch(event.request)
+      })
+  )
+})
+
+self.addEventListener('message', (event) => {
+  if (event.data.action === 'skipWaiting') {
+    self.skipWaiting()
+  }
+})