Add Emacs desktop provisioning and dev toolchain packages

Install Emacs and copy the desktop .emacs.d config so the editor setup is managed with the rest of desktop dotfiles. Add vterm/build/debug dependencies plus C/C++ and Go tooling needed by the configured workflow.

dotfiles/desktop/.emacs.d/lisp/misc/dashboard.el

@@ -0,0 +1,17 @@
+;;; dashboard.el --- Startup dashboard -*- lexical-binding: t; -*-
+
+(use-package dashboard
+  :ensure t
+  :init
+  (setq dashboard-startup-banner 'logo
+        dashboard-center-content t
+        dashboard-set-heading-icons t
+        dashboard-set-file-icons t
+        dashboard-items '((recents  . 8)
+                          (projects . 5)))
+  :config
+  (dashboard-setup-startup-hook))
+
+(provide 'dashboard)
+
+;;; misc-dashboard.el ends here