Add open graph meta tags to home page

[msound]

I shared http://rancherdesktop.io on slack with my colleagues and realized it did not unfurl the link.

Please add Open Graph meta tags.

[jandubois]

https://medium.com/slack-developer-blog/everything-you-ever-wanted-to-know-about-unfurling-but-were-afraid-to-ask-or-how-to-make-your-e64b4bb9254