Revert "Temporarily remove persistence."

This reverts commit 0bb1ec30.

src/main.js

@@ -17,6 +17,8 @@ import configModule from './modules/config.js'
 
 import VueTimeago from 'vue-timeago'
 
+import createPersistedState from './lib/persisted_state.js'
+
 Vue.use(Vuex)
 Vue.use(VueRouter)
 Vue.use(VueTimeago, {
@@ -26,6 +28,15 @@ Vue.use(VueTimeago, {
   }
 })
 
+const persistedStateOptions = {
+  paths: [
+    'config.hideAttachments',
+    'config.hideNsfw',
+    'statuses.notifications',
+    'users.users'
+  ]
+}
+
 const store = new Vuex.Store({
   modules: {
     statuses: statusesModule,
@@ -33,6 +44,7 @@ const store = new Vuex.Store({
     api: apiModule,
     config: configModule
   },
+  plugins: [createPersistedState(persistedStateOptions)],
   strict: process.env.NODE_ENV !== 'production'
 })