Redesign public hashtag pages (#5237)

app/javascript/mastodon/containers/timeline_container.js

@@ -6,6 +6,7 @@ import { hydrateStore } from '../actions/store';
 import { IntlProvider, addLocaleData } from 'react-intl';
 import { getLocale } from '../locales';
 import PublicTimeline from '../features/standalone/public_timeline';
+import HashtagTimeline from '../features/standalone/hashtag_timeline';
 
 const { localeData, messages } = getLocale();
 addLocaleData(localeData);
@@ -22,15 +23,24 @@ export default class TimelineContainer extends React.PureComponent {
 
   static propTypes = {
     locale: PropTypes.string.isRequired,
+    hashtag: PropTypes.string,
   };
 
   render () {
-    const { locale } = this.props;
+    const { locale, hashtag } = this.props;
+
+    let timeline;
+
+    if (hashtag) {
+      timeline = <HashtagTimeline hashtag={hashtag} />;
+    } else {
+      timeline = <PublicTimeline />;
+    }
 
     return (
       <IntlProvider locale={locale} messages={messages}>
         <Provider store={store}>
-          <PublicTimeline />
+          {timeline}
         </Provider>
       </IntlProvider>
     );