Remove unused variables (#3906)

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

@@ -2,7 +2,6 @@ import React from 'react';
 import Column from '../ui/components/column';
 import ColumnLink from '../ui/components/column_link';
 import ColumnSubheading from '../ui/components/column_subheading';
-import Link from 'react-router-dom/Link';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import { connect } from 'react-redux';
 import PropTypes from 'prop-types';