add theme bloggraph

[desmondlzy]

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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[desmondlzy]

maybe I'm totally dumb, but I really have no idea why the build log keeps showing error from another theme error: academic-cv: no image found for "images/tn"? Checked out the repo github.com/HugoBlox/hugo-blox-builder/starters/academic-cv and they indeed don't have an images/tn. But other recent pull requests don't seem to have this problem.

@hugo-sid do you by any chance have an idea of what's going on? thanks.