fix(treemacs): replace all-the-icons with nerd-icons

Ref: #7411
Close: #7428
Ref: https://discourse.doomemacs.org/t/4147

modules/ui/treemacs/config.el

@@ -42,6 +42,11 @@ This must be set before `treemacs' has loaded.")
             0))))
 
 
+(use-package! treemacs-nerd-icons
+  :after treemacs
+  :config (treemacs-load-theme "nerd-icons"))
+
+
 (use-package! treemacs-evil
   :when (modulep! :editor evil +everywhere)
   :defer t

modules/ui/treemacs/packages.el

@@ -2,6 +2,7 @@
 ;;; ui/treemacs/packages.el
 
 (package! treemacs :pin "fe471314f198f9aff268637a766a6ade0a5b5d96")
+(package! treemacs-nerd-icons :pin "9876cb478145a0ec4e36f64ff6583f3de7126216")
 ;; These packages have no :pin because they're in the same repo
 (when (modulep! :editor evil +everywhere)
   (package! treemacs-evil))