refactor!: replace all-the-icons with nerd-icons

BREAKING CHANGE: This commit replaces all-the-icons with nerd-fonts. Any
all-the-icons-* function calls or variable references in your private
config will break and should be replaced with their nerd-icons-*
equivalent. That said, Doom will continue to install all-the-icons for
a while, so feel free to load it if you don't want to fully commit to
the change yet.

This change is happening because nerd-icon has wider support for GUI and
TUI Emacs; has a larger, more consistent selection of symbols; plus unicode
coverage.

Fix: #7368
Close: #6675
Close: #7364

modules/emacs/ibuffer/README.org

@@ -15,7 +15,7 @@ This module augments the built-in [[doom-package:ibuffer]] package.
 
 ** Module flags
 - +icons ::
-  Enable filetype icons for buffers using [[doom-package:all-the-icons]].
+  Enable filetype icons for buffers using [[doom-package:nerd-icons]].
 
 ** Packages
 - [[doom-package:ibuffer-projectile]]

modules/emacs/ibuffer/config.el

@@ -25,11 +25,11 @@
   ;; Display buffer icons on GUI
   (define-ibuffer-column icon (:name "  ")
     (let ((icon (if (and (buffer-file-name)
-                         (all-the-icons-auto-mode-match?))
-                    (all-the-icons-icon-for-file (file-name-nondirectory (buffer-file-name)) :v-adjust -0.05)
-                  (all-the-icons-icon-for-mode major-mode :v-adjust -0.05))))
+                         (nerd-icons-auto-mode-match?))
+                    (nerd-icons-icon-for-file (file-name-nondirectory (buffer-file-name)) :v-adjust -0.05)
+                  (nerd-icons-icon-for-mode major-mode :v-adjust -0.05))))
       (if (symbolp icon)
-          (setq icon (all-the-icons-faicon "file-o" :face 'all-the-icons-dsilver :height 0.8 :v-adjust 0.0))
+          (setq icon (nerd-icons-faicon "nf-fa-file_o" :face 'nerd-icons-dsilver :height 0.8 :v-adjust 0.0))
         icon)))
 
   ;; Redefine size column to display human readable size
@@ -72,8 +72,8 @@
   :config
   (setq ibuffer-projectile-prefix
         (if (modulep! +icons)
-            (concat (all-the-icons-octicon
-                     "file-directory"
+            (concat (nerd-icons-octicon
+                     "nf-oct-file_directory"
                      :face ibuffer-filter-group-name-face
                      :v-adjust -0.05)
                     " ")