Point the build badge at the right workflow

[timkpaine]

The docs landing page referenced build.yml, but the workflow file is build.yaml, so the badge image 404ed on the published site.

Description

Brief description of the changes in this PR.

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor / code cleanup
• CI / build configuration
• Other (describe below)

Checklist

• Linting passes (make lint)
• Tests pass (make test)
• New tests added for new functionality
• Documentation updated (if applicable)
• Changelog / version bump (if applicable)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.19%. Comparing base (526cd4a) to head (2630187).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #155   +/-   ##
=======================================
  Coverage   86.19%   86.19%           
=======================================
  Files          16       16           
  Lines        2021     2021           
  Branches      209      209           
=======================================
  Hits         1742     1742           
  Misses        217      217           
  Partials       62       62           

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