Fix pkgdown workflow: correct file paths and update deprecated actions

[Copilot]

• Fix pkgdown workflow path triggers and deprecated actions
• Investigate pkgdown build failures
• Fix getting-started.qmd variable reference errors (case_data → simulated_data)
• Remove redundant postprocess_jags_output() call in getting-started.qmd
• Verify vignette renders successfully with quarto render
• Clean up accidentally committed artifacts
• Verify CI passes

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

[d-morrison]

pkgdown workflow is still failing; fix issues in getting-started.qmd

[d-morrison]

pkgdown is still broken; fix

[Copilot]

pkgdown is still broken; fix

Fixed in e79c669. The getting-started.qmd vignette had two issues:

1. Variable reference errors: The plot_predicted_curve call referenced case_data but should have referenced simulated_data (the data used to fit the model)
2. Incorrect postprocess call: The vignette called postprocess_jags_output() on output from run_mod(), but run_mod() already returns processed output. The call should go directly to post_summ()

The vignette now renders successfully with quarto render.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• cdn.jsdelivr.net
  • Triggering command: /opt/R/4.5.2/lib/R/bin/exec/R /opt/R/4.5.2/lib/R/bin/exec/R --slave --no-save --no-restore -f /tmp/RtmpXApEqA/callr-scr-2d5d2893d4e (dns block)

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• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
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[github-actions]

📕 Preview documentation for this PR has been cleaned up.