Fontcustom / iconfont replacement

[TWiStErRob]

Problems:

• Last update: 7 years ago at https://github.com/FontCustom/fontcustom
• Requires Ruby 2.7.x, see /usr/local/lib/ruby/gems/3.2.0/gems/fontcustom-2.0.0/lib/fontcustom/options.rb:50:in set_config_path': undefined method exists?' for File:Class (NoMethodError) if File.exists? "fontcustom.yml"  FontCustom/fontcustom#399 (comment)
• Windows installation is problematic: https://github.com/FontCustom/fontcustom/pull/375/files

Options:

• GH-pages 161 whitelisted https://github.com/primer/octicons at https://github.com/github/pages-gem/pull/483/files
• ?