Update the Zen theme to v4.

[frjo]

After you have read the instructions for adding a theme, please make sure:

• [x] your theme.toml is complete
  • [x] name
  • [x] license
  • [x] licenselink
  • [x] description
  • [x] homepage
  • [x] demosite (if one exists)
  • [x] tags
  • [x] features
  • [x] authors/author (depending on whether the theme has multiple or a single author)
  • [x] original (if the theme is a fork)
• [x] you're using absolute paths for images in your README
• [x] you've got appropriate thumbnail and screenshot images
• [x] your theme comes with an appropriate license

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