feat: implement PWA update prompt and manual reload

src/main.js

@@ -31,23 +31,3 @@ app.directive('cell-hover', vCellHover)
 
 app.mount('#app')
 
-if ('serviceWorker' in navigator) {
-  let refreshing = false
-  const triggerReload = () => {
-    if (refreshing) return
-    refreshing = true
-    window.location.reload()
-  }
-  navigator.serviceWorker.addEventListener('controllerchange', triggerReload)
-  const checkForUpdate = () => {
-    navigator.serviceWorker.getRegistration().then((registration) => {
-      if (registration) {
-        registration.update()
-      }
-    })
-  }
-  window.addEventListener('visibilitychange', () => {
-    if (document.visibilityState === 'visible') checkForUpdate()
-  })
-  window.addEventListener('focus', checkForUpdate)
-}