manpage: update MAINTAINERS section

removes a couple maintainers who have never been active in the
development.

there are a couple other maintainers have not been active in a while,
but was somewhat active in the past. so keep their names in it
(for now at least).

also re-arrange the entires a bit based on activity.

etc/nsxiv.1

@@ -560,15 +560,13 @@ NRK                    <nrk at disroot.org>
 Berke Kocaoğlu         <berke.kocaoglu at metu.edu.tr>
 TAAPArthur             <taaparthur at gmail.com>
 eylles                 <ed.ylles1997 at gmail.com>
+Stein Gunnar Bakkeby   <bakkeby at gmail.com>
+explosion-mental       <explosion0mental at gmail.com>
 mamg22                 <marcomonizg at gmail.com>
 LuXu
-explosion-mental       <explosion0mental at gmail.com>
 Guilherme Freire
-Stein Gunnar Bakkeby   <bakkeby at gmail.com>
-Anupam Ashish Minz
 Sam Whitehead
 Kian Kasad             <kian at kasad.com>
-qsmodo
 .EE
 .SH CONTRIBUTORS
 .EX