feat: adding the njs alias for nginx

[smirnoffmv]

Description

Adding the njs alias for nginx

[netlify]

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[netlify]

✅ Deploy Preview for shiki-matsu ready!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.17%. Comparing base (0ab9a2d) to head (48df740).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #611   +/-   ##
=======================================
  Coverage   96.17%   96.17%           
=======================================
  Files          70       70           
  Lines        5698     5698           
  Branches      751      751           
=======================================
  Hits         5480     5480           
  Misses        212      212           
  Partials        6        6           

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[antfu]

This file is generated. Please send PR to https://github.com/shikijs/textmate-grammars-themes instead.