Revert "Map light/dark theme toggle to SPC t t"

This reverts commit 666490c13f.

+ui.el

@@ -23,12 +23,3 @@
 ;; Shrink minibuffer
 (after! ivy
   (setq ivy-height 10))
-;; Switch between light and dark theme
-(after! heaven-and-hell
-  (setq heaven-and-hell-themes
-        '((light . doom-nord-light)
-          (dark . doom-nord)))
-  (setq heaven-and-hell-load-theme-no-confirm t)
-  (map!
-   :leader "t t" 'heaven-and-hell-toggle-theme))
-(add-hook 'after-init-hook 'heaven-and-hell-init-hook)

packages.el

@@ -6,4 +6,3 @@
 ;; (package! another-package :recipe (:host github :repo "username/repo"))
 ;; (package! builtin-package :disable t)
 (package! org-super-agenda)
-(package! heaven-and-hell)