Don't tokenize empty/whitespace-only capture groups (#51)* Remove an unused variable* Skip over empty/whitespace-only capture groups* Restore CPP sample

Remove PHP 8.2 from testing matrix

Format code

Add Antlers language (#47)* Add Antlers language* Add HTML include to workaround injection problems---------Co-authored-by: Ryan Chandler <ryangjchandler@gmail.com>

Add binary info to README

Assume txt if detected grammar is null (#42)

Add gutter toggle to sample playground

fix: dont assume that all themes will highlight a token

fix: allow passing array to commonmark extension

chore: fmt