[DOC] Add references to Code Hike annotation features to blog authoring docs

> Separately, we may want to highlight the available [Code Hike annotation features][annot] in the blog authoring docs.
> 
> Some handy capability in there.

[annot]: https://codehike.org/docs/annotations

_Originally posted by @bskinn in https://github.com/Quansight/Quansight-website/issues/815#issuecomment-1832732627_
            