Remove comment section from about page

[qwang07]

Is your feature request related to a problem? Please describe. There is comment section in about page. It should be removed.

Describe the solution you'd like Create new page named about.html in theme folder. Because it always used for personal blog. That means most articles are written by the ourselves. I think one common about.html page is more make sense than different authors in config.yml. I also suggest new variable originalURL (if the article is reproduce from somewhere else) for article.md, and author can be a string which is original author of that article.