pr.helpers (development version)

Added pr_init(), pr_resume(), pr_fetch(), pr_push(), pr_pull(), pr_merge_main(), pr_view(), pr_pause(), pr_finish(), and pr_forget() helpers for pull/merge request workflows inspired by {usethis} and extended for GitLab support.
Added pr_request_url() to generate GitHub pull request and GitLab merge request URLs from git remotes.
Switched from pkgdown to altdoc for documentation generation. Now using Quarto Website for documentation with native math equation support via MathJax.
Removed pkgdown-specific configurations and workflows.
Retained RevealJS multi-format support for Quarto vignettes and articles.
Fixed index page rendering by switching from index.md to index.qmd to properly process Quarto include directive (#58)
Switched from pkgdown to altdoc (#45)
Updated lintr configuration to match serodynamics reference with enhanced linter rules
PR preview comments now use recreate: true to ensure they always appear at the bottom of the PR conversation, preventing them from being hidden in collapsed sections (#31)
Added RevealJS presentation format for Quarto vignettes and articles in pkgdown documentation. HTML pages now display an “Other Formats” section with links to slide versions (#29)

pr.helpers 0.0.0.9000