support a new open graph tags

**Issue details**

Pages with one or more of the required Open Graph tags missing.

The four required Open Graph tags for every page are og:title, og:type, og:image, and og:url.

**How to fix**

Make sure your pages have all required OG tags if you want them to look good in social feeds when shared.

Please note that the URLs inside OG tags must be absolute and utilize the http:// or https:// protocols.

You can find more information on the Open Graph protocol [here](http://ogp.me/).

see
[duplicates.csv](https://github.com/apache/apisix-website/files/7152104/duplicates.csv)