- Extracted all hardcoded repository and slide download URLs into a central _variables.yml configuration file.
- Replaced 100+ hardcoded URL strings across the website documentation (.qmd, .md, and _quarto-html.yml) with {{< var slides_latest >}} and {{< var github_repo >}} shortcodes.
- Ensures the website correctly points to the canonical cs249r_book repository while enabling instantaneous, single-file URL updates in the future.
