Copy folder and file Refer to https://www.socketloop.com/tutorials/golang-copy-directory-including-sub-directories-files

Check file if exist

Generate article list page

Generate all article page

Add files and dirs to watcher

Copy static files

Generate article list JSON

Generate rss page

Generate sitemap page

* Get all text nodes under an element * @param {!Element} el * @return {Array<!Node>}