Make it possible to configure line numbers via CodeMirror

[patrickmineault]

Description / Summary

CodeMirror supports showing line numbers through the lineNumbers option. This option appears to be set to false by default. It would be nice if we could enable this option from this Sphinx theme.

Value / benefit

When the code is run in a cell and it has an error, it references line numbers. It would be nice if those line numbers were visible in the editor.

Implementation details

I think this option could be forwarded from sphinx-thebe to mainland thebe, and then onwards to CodeMirror.

Tasks to complete

• [ ] Wait for #17 to be resolved
• [ ] Document how to change linenumbers via passthrough

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[choldgraf]

Hey - yep, this would indeed be useful. I think that it could be resolved by #17 (and one shot at implementing this here #25).