Add `Opengraph:image` & `twitter:image` meta tags

[Siddhant-K-code]

Description

Currently when we share our page, it doesn't render the Image.

We Can create a new we og:image relevant to our Page, or Can use the same what Docker is using:

Though, we have to fix the size of image. ( we should do that for docker.com also) - so that it looks good!

Possible Implementation:

Add an og:image & twitter:image metadata to the website. Use png instead of SVG here.

Context:

Check whether we are using Open Graph data

https://opengraphcheck.com/
https://developers.facebook.com/tools/debug/
https://cards-dev.twitter.com/validator

[Siddhant-K-code]

@ajeetraina Can Assign this to you.

[ajeetraina]

@ManishOffi Feel free to raise PR and improve this site.