Add noreferrer to rendered links
This MR adds rel="noreferrer"
to links. It prevents the browser from sending the Referrer
HTTP header to the external site. This is better for user privacy, but with the trade-off that it could slow down awareness of the Fediverse.
Discussion: https://spinster.xyz/objects/cf86d397-e242-413b-adfc-f5f8d88f5a3a
Pleroma BE issue: https://git.pleroma.social/pleroma/pleroma/-/issues/2352