Merge pull request #255 from abostroem/issue238

moving text about custom style sheets out of solution

Author: ShebMichel

episodes/08-plot.md

@@ -472,17 +472,15 @@ plt.plot(right_color, g, label='right color')
 plt.legend();
 ```
 
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 If you cannot find a style sheet that is exactly what you want, you can
 make your own.  This repository includes a style sheet called
 `az-paper-twocol.mplstyle`, with customizations chosen by Azalee
 Bostroem for publication in astronomy journals.
 
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 You can use it like this:
 
 ```python