Rename azos-core station suite to desktop; move discord out to azos/features

Mirrors the azos-core change: station is renamed desktop (its apps are
generically useful on any machine, work included), discord moves to its
own standalone azos/features/discord (personal-only, so it lives in the
azos project rather than azos-core), and azos-emacs-station becomes
azos-emacs-desktop in lauretta's emacs config to match.

home-manager/home.nix

@@ -11,7 +11,8 @@
     suiteModules.homeManager.base
     suiteModules.homeManager.dev
     suiteModules.homeManager.editor
-    suiteModules.homeManager.station
+    suiteModules.homeManager.desktop
+    suiteModules.homeManager.discord
     suiteModules.homeManager.exwm
     suiteModules.homeManager.lauretta
     suiteModules.homeManager.audio