[WIP] Fix the failing GitHub Actions job pkgdown

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Fix the failing GitHub Actions job "pkgdown"
Analyze the Actions logs, identify the root cause of the failure, and implement a fix.
Check run ID: 104356111495
Job URL: https://github.com/ThinkR-open/bootstrict/actions/runs/34961562952/job/104356111495