[tw5] How to add javascript to global?

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#1

I want to use the fontawesome on the site https://fontawesome.com/

Which contains more icons than the plugin Font Awesome — using Font Awesome with TiddlyWiki 5

But if you want to use the fa from https://fontawesome.com/ you need to include a javascript file first. The html like,

<!doctype html>

How do I add the code to global?