message: Restore `branch-buttons` feature
  These buttons have been missing:
diff: @@ -649,8 +649,13 @@ a.tabnav-extra[href$='mastering-markdown/'] {
  float: left;
  margin-left: 5px;
  margin-right: 5px;
  - margin-bottom: 10px; /* Eases wrapping with on long breadcrumbs */
  }
  +
  +/* Hide `New pull request1 button` near file list */
  +.file-navigation .new-pull-request-btn {
  + display: none;
  +}
  +
  /* Undo conflicting GitHub style */
  :root .rgh-branch-buttons .BtnGroup {
  margin-bottom: 0;
  