Change syntax highlighting example

[fmaussion]

Closes https://github.com/executablebooks/jupyter-book/issues/1668

[codecov[bot]]

Codecov Report

Merging #1752 (0b2d955) into master (9128148) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1752   +/-   ##
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  Coverage   91.37%   91.37%           
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  Files           7        7           
  Lines         684      684           
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  Hits          625      625           
  Misses         59       59           

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pytests	91.37% <ø> (ø)

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[choldgraf]

Actually, I think there is probably a nicer way of solving this. We should add highlight_language: none around here and see if this solves the problem:

https://github.com/executablebooks/jupyter-book/blob/9128148a088a23df4cc4eaa4271e259207cec4e9/jupyter_book/config.py#L37

This would changes the default so that no language given would default to "no highlighting", which I think is what most people would expect.

[choldgraf]

Just gonna merge this one in and we can improve broader syntax defaults later