feat: custom last working dir based on i3 desktop

to improve DX when multitasking

programs/i3.nix

@@ -19,7 +19,7 @@
 
       # see https://rycee.gitlab.io/home-manager/options.html#opt-xsession.windowManager.i3.config.keybindings
       keybindings = pkgs.lib.mkOptionDefault {
-        "${modifier}+Return" = "exec sakura"; # i3-sensible-terminal
+        "${modifier}+Return" = "exec ~/.local/bin/workspace-term";
 
         ### BÉPO ###
         "${modifier}+b" = "kill";