Improve the public hashtag page (#9831)

- Fix height not updating when clicking show more on public hashtag page
- Add header to the public hashtag page
- Change text size and margins on the public hashtag page

app/javascript/mastodon/features/status/index.js

@@ -101,6 +101,7 @@ const makeMapStateToProps = () => {
       ancestorsIds,
       descendantsIds,
       askReplyConfirmation: state.getIn(['compose', 'text']).trim().length !== 0,
+      domain: state.getIn(['meta', 'domain']),
     };
   };
 
@@ -123,6 +124,7 @@ class Status extends ImmutablePureComponent {
     descendantsIds: ImmutablePropTypes.list,
     intl: PropTypes.object.isRequired,
     askReplyConfirmation: PropTypes.bool,
+    domain: PropTypes.string.isRequired,
   };
 
   state = {
@@ -387,7 +389,7 @@ class Status extends ImmutablePureComponent {
 
   render () {
     let ancestors, descendants;
-    const { shouldUpdateScroll, status, ancestorsIds, descendantsIds, intl } = this.props;
+    const { shouldUpdateScroll, status, ancestorsIds, descendantsIds, intl, domain } = this.props;
     const { fullscreen } = this.state;
 
     if (status === null) {
@@ -438,6 +440,7 @@ class Status extends ImmutablePureComponent {
                   onOpenVideo={this.handleOpenVideo}
                   onOpenMedia={this.handleOpenMedia}
                   onToggleHidden={this.handleToggleHidden}
+                  domain={domain}
                 />
 
                 <ActionBar