Add multi-version pkgdown documentation with version dropdown menu#173

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Copilot wants to merge 10 commits intomainfrom

copilot/copy-pkgdown-setup

Commits on Jan 9, 2026

Initial plan
Copilot
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Add multi-version pkgdown workflow with version dropdown support

Copilot
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d-morrison
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Fix workflow syntax and configuration for multi-version docs

Copilot
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d-morrison
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Add NEWS entry for multi-version pkgdown setup

Copilot
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d-morrison
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Add comprehensive documentation for multi-version pkgdown setup

Copilot
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d-morrison
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Fix security vulnerability: update actions to latest v4 versions

Copilot
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d-morrison
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Add docs workflow file to path triggers

Copilot
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d-morrison
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Remove path filters from docs workflow to ensure it always runs

Copilot
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d-morrison
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Restore path filters and allow draft PRs to run workflow

Copilot
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d-morrison
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Fix workflow conditions and add conditional devel parameter

Copilot
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d-morrison
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