message: refactor(docs-infra): remove unused CSS for the version selector
  This commit removes some CSS rules targeting `.doc-version select` in
  the sidenav. These rules do not match any elements any more, since now
  we use a custom `<aio-select>` component (instead of the `<select>`
  element).
  PR Close
diff: @@ -36,20 +36,6 @@ mat-sidenav-container.sidenav-container {
  .doc-version {
  padding: 8px;
  border-top: 1px solid $lightgray;
  -
  - select {
  - outline: none;
  - width: 100%;
  - background: rgba($lightgray, 0.5);
  - height: 32px;
  - border: 1px solid $lightgray;
  - color: $darkgray;
  -
  - option {
  - font-family: $main-font;
  - @include font-size(14);
  - }
  - }
  }
  }
  }
  