Use CH.Code component for notebook in-out pairs #752
                
     Merged
            
            
          
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This PR is on top of #647.
This is an attempt at fixing #679.
In trying to find a way to format notebook code cells with input and output stacked on top of each other, I couldn't find any kind of Remark plugin or other tool that would easily fit within our current blog post build system (mdx + remark + code-hike).
But I discovered the panels feature by Code Hike, which might meet our needs.
The syntax looks like this:
And the result looks like this, when rendered in HTML on our website: