message: Drop generic linkifier from `linkify-branch-refs`
  Closes
  Partial solution to
diff: import React from 'dom-chef';
  -import select from 'select-dom';
  import elementReady from 'element-ready';
  import features from '../libs/features';
  -import * as pageDetect from '../libs/page-detect';
  import {getOwnerAndRepo} from '../libs/utils';
  import {wrap} from '../libs/dom-utils';
  -function inPR(): void {
  - let deletedBranch: string | undefined;
  - const lastBranchAction = select.all(`
  - .discussion-item-head_ref_deleted .commit-ref,
  - .discussion-item-head_ref_restored .commit-ref
  - `).pop();
  - if (lastBranchAction && lastBranchAction.closest('.discussion-item-head_ref_deleted')) {
  - deletedBranch = lastBranchAction.textContent!.trim();
  - }
  -
  - // Find the URLs first, some elements don't have titles
  - const urls = new Map<string, string>();
  - for (const el of select.all('.commit-ref[title], .base-ref[title], .head-ref[title]')) {
  - const [repo, branch] = el.title.split(':');
  - const branchName = el.textContent!.trim();
  - urls.set(
  - branchName,
  - `/${repo}`
  - );
  - if (branchName !== deletedBranch) {
  - urls.set(
  - branchName,
  - `/${repo}/tree/${encodeURIComponent(branch)}`
  - );
  - }
  - }
  -
  - for (const el of select.all('.commit-ref')) {
  - const branchName = el.textContent!.trim();
  -
  - if (branchName !== 'unknown repository') {
  - if (branchName === deletedBranch) {
  - el.title = 'Deleted';
  - el.style.textDecoration = 'line-through';
  - }
  -
  - wrap(el, <a href={urls.get(branchName)}></a>);
  - }
  - }
  -}
  -
  -async function inQuickPR(): Promise<void> {
  +async function init(): Promise<void> {
  const el = await elementReady('.branch-name');
  if (el) {
  const {ownerName, repoName} = getOwnerAndRepo();
  @@ -56,19 +13,10 @@ async function inQuickPR(): Promise<void> {
  }
  }
  -function init(): void {
  - if (pageDetect.isPR()) {
  - inPR();
  - } else if (pageDetect.isQuickPR()) {
  - inQuickPR();
  - }
  -}
  -
  features.add({
  id: __featureName__,
  description: 'Click on branch references in pull requests',
  include: [
  - features.isPR,
  features.isQuickPR
  ],
  load: features.onAjaxedPages,
  