Update spreadsheets.qmd (#1765)

Update iteration.qmd (#1757)

Update base-R.qmd (#1779)

Update numbers.qmd (#1761)

Update webscraping.qmd (#1767)

Update workflow-help.qmd (#1770)

Update base-R.qmd (#1772)

Update layers.qmd (#1759)

Update joins.qmd (#1758)

Update logicals.qmd (#1760)

Update quarto.qmd (#1762)

Update rectangling.qmd (#1763)

Update transform.qmd (#1766)

Update regexps.qmd (#1764)

Update workflow-scripts.qmd (#1768)