pinwheel: Replace purple color scheme with grayscale and amber

Terminals, tmux and Emacs share a grayscale palette with amber
accents instead of Dracula, and the desktop bars and menus use a
matching gray background.

hosts/pinwheel/modules/emacs/config.org

@@ -159,7 +159,7 @@
 ** Theme
 #+BEGIN_SRC emacs-lisp
   (use-package doom-themes
-    :init (load-theme 'doom-dracula t))
+    :config (load-theme 'doom-submarine t))
 #+END_SRC
 ** Disable the menu bar
 #+BEGIN_SRC emacs-lisp