The statistics UI component has been updated. The default selectors for `pvEl` and `countEl` have changed from `#ArtalkPV` and `#ArtalkCount` to `.artalk-pv-count` and `.artalk-comment-count` (see #826 for more details). However, it remains backward compatible with the `#ArtalkPV` and `#ArtalkCount` elements for older versions, no HTML client updates are necessary.
In this PR, we also introduced a configuration option called `statPageKeyAttr` (value `"data-page-key"` by default) for customizing the attribute name that the statistics component uses to fetch the page key.