Add alias for "systemctl cat" and "systemctl edit"

plugins/systemd/systemd.plugin.zsh

 user_commands=(
   list-units is-active status show help list-unit-files
-  is-enabled list-jobs show-environment)
+  is-enabled list-jobs show-environment cat)
 
 sudo_commands=(
   start stop reload restart try-restart isolate kill
   reset-failed enable disable reenable preset mask unmask
-  link load cancel set-environment unset-environment)
+  link load cancel set-environment unset-environment
+  edit)
 
 for c in $user_commands; do; alias sc-$c="systemctl $c"; done
 for c in $sudo_commands; do; alias sc-$c="sudo systemctl $c"; done