update documentation (#448)

the fedora copr repo is no longer being updated since the maintainer of
it, mamg22, no longer uses nsxiv in his daily setup (and thus stopped
contributing to nsxiv as well).

he has requested the repo and his email to be removed from the project.
so go ahead and honor that request.

also take this as an opportunity to remove some long inactive
maintainers from the CURRENT MAINTAINERS section of the manpage.

Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/448
Reviewed-by: explosion-mental <explosion-mental@noreply.codeberg.org>

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