Update moderation team (#1156)

- piegames joined
(https://discourse.nixos.org/t/welcome-piegames-to-the-moderation-team/35469)
- Alyssa is leaving
- grahamc is leaving

---------

Co-authored-by: Graham Christensen <graham@grahamc.com>

community/teams/moderation.tt

@@ -21,12 +21,11 @@ href="https://github.com/NixOS/rfcs/blob/master/rfcs/0102-moderation-team.md">RF
   <aside>
     <h2>Members</h2>
     <ul>
-      <li><a href="https://discourse.nixos.org/u/qyliss/">Alyssa Ross</a> (qyliss / alyssais)</li>
-      <li><a href="https://discourse.nixos.org/u/grahamc">Graham Christensen</a> (gchristensen)</li>
       <li><a href="https://discourse.nixos.org/u/mic92">Jörg Thalheim</a> (Mic92)</li>
       <li><a href="https://discourse.nixos.org/u/hexa">Martin Weinelt</a> (Hexa)</li>
       <li><a href="https://discourse.nixos.org/u/garbas">Rok Garbas</a> (garbas)</li>
       <li><a href="https://discourse.nixos.org/u/ryantm/">Ryan Mulligan</a> (ryantm)</li>
+      <li><a href="https://discourse.nixos.org/u/piegames/">piegames</a> (piegamesde)</li>
     </ul>
   </aside>