Are you using a js library now? If not, you could just add it to your site. I can put together a jsfiddle with all the code and where to paste it if that would help.
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I've tried setting
kramdown:
syntax_highlighter_opts:
block:
line_numbers: true
But that's not nice out of the box and I couldn't clear the table margin-top margin-bottom somehow. Plus I'd like the style of 1., 2. with dots...
Are you using a js library now? If not, you could just add it to your site. I can put together a jsfiddle with all the code and where to paste it if that would help.