feat(icons): use nerd-fonts to display icons in terminals

Uses the new nerd-icons package to display icons in various places
similar to all-the-icons. But it works in a terminal too as long as the
terminal is using a Nerd Font.

core/siren-core-macos.el

@@ -22,15 +22,17 @@
 ;; When running in GUI mode.
 (when window-system
   ;; Set default font based on priority list
-  (let* ((families '("Menlo Nerd Font Mono"
+  (let* ((families '("Menlo Nerd Font"
+                     "Menlo Nerd Font Mono"
                      "Menlo for Powerline"
                      "Menlo"
                      "Monaco Nerd Font Mono"
                      "Monaco for Powerline"
                      "Monaco"))
+         (available (font-family-list))
          (family (catch 'found
                    (dolist (f families)
-                     (if (member f (font-family-list))
+                     (if (member f available)
                          (throw 'found f))))))
     (set-face-attribute 'default nil :family family :height 120))