Switch back to Vim

- Change default editor back to vim since doom-emacs is broken at the
  moment
- Conditionally include emacs or vim nix files in configuration.nix
- User username to find dwm-flexipatch path on system
- Add tree and btop to miscellaneous system packages
- Add some cli tools like just and git to home-manager packages
- Add more XDG env vars for config and cache

profiles/personal/home.nix

@@ -12,6 +12,7 @@
   imports = [
     (../../user/browser + "/${userSettings.browser}.nix")
     ../../user/development/default.nix
+    (if userSettings.editor == "emacsclient" then ../../user/development/doom-emacs.nix else (../../user/development + "/${userSettings.editor}.nix"))
     ../../user/gaming/default.nix
     ../../user/launcher/default.nix
     ../../user/media/default.nix