Use moment from NPM

app/components/conference-day.js

@@ -1,6 +1,6 @@
 import Component from '@glimmer/component';
 import { computed } from '@ember/object';
-import moment from 'emberconf/libs/moment';
+import moment from 'moment';
 
 export default class extends Component {
 

app/components/conference-session.js

@@ -2,7 +2,7 @@ import Component from '@glimmer/component';
 import { computed } from '@ember/object';
 import { tracked } from '@glimmer/tracking';
 import ENV from 'emberconf/config/environment';
-import moment from 'emberconf/libs/moment';
+import moment from 'moment';
 
 export default class extends Component {
   @tracked

app/controllers/index.js

@@ -4,7 +4,7 @@ import { later } from '@ember/runloop';
 import { inject as service } from '@ember/service';
 import { tracked } from '@glimmer/tracking';
 import ENV from 'emberconf/config/environment';
-import moment from 'emberconf/libs/moment';
+import moment from 'moment';
 
 export default class extends Controller {
   @service fastboot;