* move `id: can-reproduce` to first position to give incentivize reproducers.
If the description comes first, the person filing the bug report
will describe the problem in plain English. It is better if the
first thing they do, if at all possible, is to create a reproducer
and provide a link.
* remove `id: os-ver` as it has never been relevant.
* do not require `id: forgejo-ver` because it does not matter that much
as long as it can be reproduced on try.next.
* remove "If the error appears to relate to Forgejo the server" as it
has never been relevant.
* require the description
