* update languages.toml: tree-sitter-lua grammar
repo has moved, use new URL and the rev of the latest release (v0.0.19)
* update highlight queries
a novice attempt to port query updates from the
source repo to Helix captures and ordering
* Apply suggestions from code review
Co-authored-by: Michael Davis <mcarsondavis@gmail.com>
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Co-authored-by: Michael Davis <mcarsondavis@gmail.com>