Static notebook fixes and examples #511
   Merged  
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Fixes #503 and #476.
This PR adds static HTML DataFrames to .ipynb files, both when rendering DataFrames in Swing and HTML such that they can be displayed on Github. For example: https://github.com/Kotlin/dataframe/blob/static-examples2/examples/notebooks/github/github.ipynb
At the moment, I excluded the
jsonexample because enabling static output makes the file 170MB+ and thus too large for GitHub. This probably needs #512 to be fixed beforehand.Non-JS collapsible DataFrames also should be explored later: #513.