Nushell Theming Improvements

2nd chunk of `blog/2020-09-01-nushell_0_19.md`

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_Nu, with love_

We're continuing to expand what's possible with Nu's themes, allowing you to configure more areas of how your data is displayed.

Title: Nushell Theming Improvements

Summary

Nushell continues to expand theming capabilities, allowing users to configure more areas of data display. This enhances the customization and visual appeal of the shell.