We shouldn't treat these like local statuses, but I don't think a 404
is the right choice either here, because within pleroma-fe, these are
valid URLs. So with remote notices you have the awkward situation
where clicking a link will behave differently depending on whether you
open it in a new tab or not; the new tab will 404 if it hits static-fe.
This new redirecting behavior should improve that situation.
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