Added OpenGraph and Twitter meta tags for better link previews

[Harshal-Taori-11]

Fix #2191

[CLAassistant]

All committers have signed the CLA.

[robintown]

Hi, we're certainly interested in having OpenGraph tags like this. The application can be configured to use a brand name other than "Element Call" via the VITE_PRODUCT_NAME environment variable, so the main thing we'd like to see here is that the OpenGraph tags respect this variable by template-ing it in.

I'd also suggest leaving the 'URL' and 'domain' tags out of the metadata entirely because we want our builds to be something you can easily download from GitHub and host on your own server without any references to our call.element.io deployment. I'm not too familiar with OpenGraph, is it possible to just not set those without breaking link previews?

[Harshal-Taori-11]

Hi, yes I will make changes.

I think we can remove those tags.So I will remove them.