message: Make `follow-file-renames` more noticeable by adding icons
diff: import React from 'dom-chef';
  import select from 'select-dom';
  import * as pageDetect from 'github-url-detection';
  +import {DiffRenamedIcon} from '@primer/octicons-react';
  import features from '.';
  import * as api from '../github-helpers/api';
  @@ -40,7 +41,9 @@ async function linkify(button: HTMLButtonElement, url: GitHubURL): Promise<void
  aria-label={`Renamed ${isNewer ? 'to' : 'from'} ${file[toKey]}`}
  className="btn btn-outline BtnGroup-item tooltipped tooltipped-n tooltipped-no-delay"
  >
  + {isNewer && <DiffRenamedIcon className="mr-1" transform="rotate(180)"/>}
  {button.textContent}
  + {!isNewer && <DiffRenamedIcon className="ml-1"/>}
  </a>,
  );
  }
  