* use logical `NA` that can be cast to character

* chore: Use ggplot2's default color scale `na.value`

* chore: document()

* chore: Also set `na.value = "grey50"` in `scale_xaringan_discrete()`.

* chore: Add news item

---------

Co-authored-by: Garrick Aden-Buie <garrick@adenbuie.com>

* Increment version number to 0.4.3

* chore: add cran comments

* Fix indents and invisible characters (GitHub Actions)

* Re-build README.Rmd (GitHub Actions)

* Re-build index.Rmd (GitHub Actions)

* chore: urlchecker::url_update()

* chore: align and register s3 print methods

* tests: Update and fix tests

* docs: update link in thanks

---------

Co-authored-by: gadenbuie <gadenbuie@users.noreply.github.com>

* use UK spelling of colour

* Increment version number to 0.4.2.9000

* docs: add NEWS item

* chore: devtools::document()

---------

Co-authored-by: Garrick Aden-Buie <garrick@adenbuie.com>

Fixes #65

* Increment version number

* Better horizontal alignment of code blocks

* Use testthat 3e

* Use expect_known_output() because we need the css files

* Replace `with_mock()` with `mockery::stub()`

* Remove extraneous line

* Set ml and mr for all horiz alignment classes

* Add NEWS for #68

Fixes #36

Updates color examples and adds left-column headings demo to skeleton

Fixes #53

Fixes #50

Fixes #41

Fixes #44

* e.g. style_duo() <- duo()
* style_xaringan <- write_xaringan_theme()
* style_extra_css <- write_extra_css()
* added NEWS entry
* updated docs and /docs