added options for highlighint
added options for highlighint

  syntax_highlighter_opts:
    # Rouge Options › https://github.com/jneen/rouge#full-options
    css_class: 'highlight'
    #line_numbers: true # bad idea, spans don't need linenos and would inherit this option
    span:
      line_numbers: false
    block:
      line_numbers: true
      start_line: 1
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