tap: allow sharding of fonts in Homebrew/cask

Signed-off-by: Patrick Linnane <patrick@linnane.io>

Co-authored-by: Carlo Cabrera <30379873+carlocab@users.noreply.github.com>

Co-authored-by: Mike McQuaid <mike@mikemcquaid.com>

Library/Homebrew/tap.rb

@@ -1397,7 +1397,12 @@ def core_cask_tap?
 
   sig { params(token: String).returns(Pathname) }
   def new_cask_path(token)
-    cask_subdir = token[0].to_s
+    cask_subdir = if token.start_with?("font")
+      "font/#{token.sub(/^font-?/).first}"
+    else
+      token[0].to_s
+    end
+
     cask_dir/cask_subdir/"#{token.downcase}.rb"
   end