Hide section headline for timelines in production (#7590)

* Hide section headline for timelines in production

* comment out

app/javascript/mastodon/features/community_timeline/components/section_headline.js

@@ -0,0 +1,59 @@
+import PropTypes from 'prop-types';
+import React, { Component, Fragment } from 'react';
+import { FormattedMessage } from 'react-intl';
+import { NavLink } from 'react-router-dom';
+
+export default class SectionHeadline extends Component {
+