Add back the zen theme.

[frjo]

Attempting to add back the Zen theme. Related PRs: #439, #440, #435

• [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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[frjo]

If I add my theme with github.com/frjo/hugo-theme-zen (no version part) the preview does not include the Zen theme at all.

If I add my theme with github.com/frjo/hugo-theme-zen/v3 (with version part) the preview displays the Zen theme in order but with an incorrect path for the download button. It sets the download path to include the version part making the download link end in a 404.

There seems to be a bug with setting html_url for themes with a version. I suspect it works for some theme due to the correct html_url being cached.