Get rid of unused fetch

Author: Daltz333

source/_extensions/pwa_service_files/sw.js

@@ -2,12 +2,6 @@
 // https://developer.mozilla.org/en-US/docs/Web/Progressive_web_apps/Offline_Service_workers
 var cacheName = 'js13kPWA-v1';
 
-fetch('_static/cache.json')
-.then(response => addEventListeners(response.json()))
-  .catch(error => {
-    console.error(error);
-});
-
 self.addEventListener('install', function(e) {
     e.waitUntil(
         caches.open('frc-docs').then(function(cache) {