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d171e698fa
When an invalid Font Awesome icon name is used (e.g. in git-repository-icon),
the error message now includes the icon name, the type that was searched,
valid prefix options (fas/fab/far), and a link to the FontAwesome icon gallery.
Before: Missing font github
After: Unknown Font Awesome icon `github` for type `regular`. Hint: check
the icon name and prefix (fas (solid), fab (brands), or far (regular))
at https://fontawesome.com/v6/search?m=free
Fixes #3023