Add support for fediverse.creator meta tag

[just1602]

Describe the problem to be solved

Hello,

Mastodon just released this new feature, and after giving a quick look in the issue, I didn't find any place where it was mention.

I was wondering if was plan to be supported, since it would help to onboard more video content creator to the Fediverse.

Describe the solution you would like

I think it could be derived automatically from the user account, but that could be nice if people could set another account instead of the peertube one. For example, if a media that has a peertube account, but want people to follow them on their mastodon or pixelfed account.