add changes from v0.3

pages/offline.js

@@ -0,0 +1,23 @@
+import { useEffect } from 'react'
+import Router from 'next/router'
+
+import addBase from '../src/util/addBase'
+
+export default function Offline() {
+  // force next to render correct route on mount
+  useEffect(() => {
+    const { pathname, search } = window.location
+    let origRoute = pathname + search
+    let curRoute = origRoute.split(addBase('/'))
+    curRoute.splice(0, 1)
+    curRoute = '/' + curRoute.join(addBase('/'))
+
+    if (curRoute === '/offline' && navigator.onLine) {
+      curRoute = '/'
+      origRoute = '/'
+    }
+    Router.push(curRoute, origRoute)
+  }, [])
+
+  return null
+}