v1.0.3

No functional changes to the add-in (same 10 functions as v1.0.0-v1.0.2).

What's new

• Added a project logo and banner (assets/): an icon mark of a date cell
  converting into a Julian-day dial, plus a wordmark banner shown at the
  top of README.md.
• Added a 1280x640 social-preview image, set as the repo's GitHub social
  preview.
• Added a favicon set for the docs/ markdown (docs/assets/), ready to
  wire in if docs/ becomes an HTML site.
• Fixed README.md's pre-built-download link, which still pointed at the
  v1.0.1 release tag; it now points at v1.0.3.
• juliandate_demo.ods is now attached below alongside JulianDate.oxt,
  so the worked example in docs/HOWTO.md no longer needs a separate
  download from the repo.

See CHANGELOG.md for the full history.

JulianDate.oxt below is the pre-built extension — install with unopkg add --force JulianDate.oxt, or build it yourself from source via build.sh/build.ps1.