Add “click to load more articles” function implementation method for WordPress theme

We should often see that many websites do not use the paging function, but “click to load more articles” to achieve the page turning effect. The theme currently used by Lao Jiang also has this function, but I personally don’t particularly like this function, so I still use the paging effect. However, for some projects, especially mobile websites, the experience of using load paging will be better.