Add fediverse identity to meta data

[Sakrecoer]

Note for later:

Mastodon rolled out a new feature

This means that if we add this line to the metadata, our fedi handle will appear in any post containing a link to us on mastodon instances.

<meta name="fediverse:creator" content="@dyne@toot.community" />

I will look into adding it to news.dyne.org as well.

[Sakrecoer]

:heavy_check_mark: added to news.dyne.org

[jaromil]

added to components/metatags.astro