Disable service workers (#760)

While an offline site is nice to have, it adds more problems than it solves for this kind of page.
In the effort to reduce maintenance burden I'm removing the service workers.
This first PR manually unregisters the service workers and later in a couple of months we can remove the sw.js file.

package.json

@@ -8,7 +8,7 @@
     "js": "shx mkdir -p dist/_js && terser src/_js/main.js -cm -o dist/_js/main.js",
     "json": "json-minify src/.webmanifest > dist/.webmanifest",
     "xml": "minify-xml --in-place dist/sitemap.xml && minify-xml --in-place dist/blog.atom && minify-xml --in-place dist/features.atom",
-    "sw": "workbox injectManifest workbox-config.js && terser dist/sw.js -cm -o dist/sw.js",
+    "sw": "terser src/sw.js -cm -o dist/sw.js",
     "copy-img": "shx cp ./node_modules/@browser-logos/{chrome,firefox,node.js,safari}/*.svg src/_css/img/",
     "copy-js": "shx cp ./node_modules/dark-mode-toggle/dist/dark-mode-toggle.min.mjs dist/_js/dark-mode-toggle.mjs",
     "img-video-dimensions": "node add-image-and-video-dimensions.js",
@@ -70,7 +70,6 @@
     "postcss-custom-properties": "^13.0.0",
     "shx": "^0.3.4",
     "superstatic": "^9.0.0",
-    "terser": "^5.16.0",
-    "workbox-cli": "^4.3.1"
+    "terser": "^5.16.0"
   }
 }

src/_js/main.js

@@ -58,12 +58,9 @@
     insertScript('https://platform.twitter.com/widgets.js');
   }
 
-  // Install our service worker.
-  if ('serviceWorker' in navigator) {
-    addEventListener('load', () => {
-      navigator.serviceWorker.register('/sw.js');
-    });
-  }
+  // Remove any existing service worker
+  navigator.serviceWorker.getRegistrations().then(
+    registrations => registrations.forEach(each => each.unregister()));
 
   // Remove UTM garbage from URLs, to make it less likely such links get shared.
   if (location.search.indexOf('utm_source') > -1) {

src/sw.js

@@ -1,23 +1 @@
-// Copyright 2018 Google Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the “License”);
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-// <https://apache.org/licenses/LICENSE-2.0>.
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an “AS IS” BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-importScripts('https://storage.googleapis.com/workbox-cdn/releases/4.0.0-alpha.0/workbox-sw.js');
-
-workbox.core.setCacheNameDetails({
-  prefix: 'v8.dev',
-});
-
-// Note: this is populated at build time.
-workbox.precaching.precacheAndRoute([]);
-
-workbox.skipWaiting();
+// Keep empty until some near future and then remove it.